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Old 06-29-2006, 07:42 PM   #1
DTECH-WRX
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Default Gauge Installation Electrical Wiring Tips and Pics Defi and Others

It seems like the gauge related wiring questions come up quite often so I thought I'd submit some tips and pics that can be used universally to correctly wire gauges to operate when the ignition is turned to the "ON" / "RUN" position instead of the "ACC" position which can get annoying especially for gauges with warnings that sound while at a zero or relatively low reading (like oil pressure). This method is just as easy as using the clock harness wiring and will give you the results as mentioned above. You will also have the gauges turning on at the same time as the main cluster so the needle sweeps happen at the same for both the cluster and gauges which is a nice plus. (with Defi gauges on vehicles with a newer STi cluster)

These pics show the wiring for a Defi Control Box II (which makes life easier since all the gauges connect to the Control Box so you only need one tap per wire) but can be used for other gauges without control boxes like Omoris by simply "daisy chaining" your tap-in squeeze connectors into the preceding gauge's wire of the same color. I opted to use Radio Shack brand tap-in connectors over the ones supplied by Defi for ease of use, a secure tap, and the slightly larger gap on the tap-in piece for the wire you are tapping. (ok and a little personal preference too)

These pictures are from a 2006 STI with auto climate control but wiring is the same for previous models with manual A/C. The same wires are available for tapping.



As you can see in the picture, the gauges/control box are wired into the following wires (three go to the radio harness and one to the A/C harness)

Constant 12V+ (Defi red wire) should go to the blue w/ red stripe wire on the radio harness.

Ignition 12V+ (Defi orange wire) should go to the green w/orange stripe on the A/C harness.

Illumination 12V+ (Defi white wire) should go to the violet wire on the radio harness.

Black Ground (Defi black wire) should go to the black wire on the radio harness.



If you have a 2006 model with the combo clock / passenger airbag light, don't forget to remove it from the clock pod (two screws), connect it back up to the clock harness, wrap it in some light weight foam for vibration avoidance and protection, and finally tuck it away under your gauge pod above the air vents. This will keep your dash AIRBAG warning light from illuminating since the clock / airbag pod is part of the overall AIRBAG circuit.



You can then end up with a perfectly working setup that looks like this...











As can be seen in the last two photos, I mounted the Defi control box in the perfect spot for ease of reach while being out of the way and also allowing for easy concealed running of the gauge sensors and other wires under the center console trim.

The gauge pod is made by Competition Concepts. Let them know you saw it here!

If anyone has any questions about the install, the wiring, or the sensor installation / placement for readings, I'll be happy to answer them.

Hope this helps those out there with their gauge installs!

***Edited*** Additional install info and pics further down in the thread (Post #20)!

***Edited*** The oil gallery plug under the intercooler can be replaced by Subaru part number 11024AA210 which is the same
gallery plug with 1/8 PT female threading that is in the front oil gallery access with the oil pressure light switch in it. You can then mount the oil pressure sensor in the oil gallery plug instead of using an oil filter sandwhich adapter, if you find it more convenient and/or necessary for your particular install.
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Last edited by DTECH-WRX; 03-08-2008 at 09:58 PM. Reason: Additional FAQ Info
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Old 06-29-2006, 10:49 PM   #2
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I like the install, very clean. Good job!


~Mike
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Old 06-30-2006, 07:55 PM   #3
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Thanks!
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Old 07-04-2006, 04:54 PM   #4
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Nice setup. Where did you get them, and how much were they?
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Old 07-05-2006, 05:21 PM   #5
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What pod is that? hehe. I like.
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Old 07-06-2006, 12:58 AM   #6
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I bought the gauges from Godspeed one of the vendors here. Drop them a call or e-mail for current pricing.

The gauge pod is made by Competition Concepts. Give them a call or drop Mark an e-mail.

The pod is great because it doesn't have a huge over hang like the Defi Pod and you can leave the pod as is or paint it if you like (the surface finish is paintable). A bit pricey, but well worth it IMHO.
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Old 07-06-2006, 08:49 AM   #7
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These colors (wires) the same as an 02? I am on my way out to install my innovative Wideband.....
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Old 07-06-2006, 01:14 PM   #8
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Holy Bajesus that is an expensive pod...
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Old 07-06-2006, 03:40 PM   #9
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Quote:
Originally Posted by Judge
These colors (wires) the same as an 02? I am on my way out to install my innovative Wideband.....
As far as I can tell from previous service manuals, they seem to be the same over the different model years.
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Old 07-06-2006, 03:46 PM   #10
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Quote:
Originally Posted by Rokudoo
Holy Bajesus that is an expensive pod...
LOL...you know what they say...you gotta pay to play...

It is a bit pricey, but the quality is second to NONE...you definitely get what you pay for. It is not some flimsy piece of plastic or dashboard material either, the pod is a heavy piece of carbon fiber material that has some heft to it.

I had a modified OEM gauge pod on my 04' WRX with some 52mm color adjustable Omori gauges (the largest you can really put in the OEM gauge pod and have them fit nicely with some modification) and it was a great setup, but the Defi gauges and this gauge pod takes things to a whole new level.
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Old 07-16-2006, 08:43 PM   #11
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bump!
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Old 07-16-2006, 10:23 PM   #12
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Good tips, man. They will help me when I install my Omoris.
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Old 07-18-2006, 09:51 PM   #13
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Did you find a way to bypass the passenger side airbag light thatís part of the clock so you donít get the airbag light to come on the dash? Or did you just leave the clock and airbag light module under the gauge pod?
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Old 07-21-2006, 05:30 PM   #14
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Bro, awesome setup. I just got mine. I have an 06 and also bought the same gauges as you, boost, exhaust gas temp and oil pressure. We are like thinking the same and crap. Anyways, please hook me up with pictures and details of how to hook all the sensors up and everything. I would greatly appreciate it. I am very mechaincally inclined but wanna do this install right the first time as these gauges and pod did cost me $1,000.00 U.S DOLLARS..... Know what I mean. I am taking a second mortagage on my house tomorrow for these beauties.

Few questions first, Does all the hardware we need come in the box with the defi's, ie: bolts, nuts, and everything or do I need to take a trip to ACE or discount auto to gather ALL the stuff needed to complete the job? Thanks in advance for your help with this and I too will take pics and show them off to all.
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Old 07-21-2006, 08:01 PM   #15
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Nice detailed wiring pictures, I'll definitely be referring to this thread when it comes time to do my own setup! Thanks!
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Old 07-28-2006, 08:33 PM   #16
DTECH-WRX
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Sorry I haven't posted sooner but I'll try and answer everyone's questions...

ecliptic: Sorry, but I haven't found a way to eliminate using the clock cluster to eliminate the dash airbag light. It really isn't a big deal though. You really do forget about the clock/airbag light once it's in there and if you wrap it up like I did you will get no rattling or annoying vibrations. Sometimes the simplest solutions are the best ones.

smac: The gauges will come with everything you need except for a few things you can improve on IMHO like the squeeze connectors and using a different technique for securing the gauges to a triple gauge pod. Also you will want to make sure you have either the Subaru oil gallery plug which screws into the engine block just below the intercooler and throttle body (sensor screws into oil gallery plug) or do as I did and use an oil filter sandwich adapter to run your oil pressure sensor to (I used the Greddy). On the STIs, especially on the '06 from what I've seen, the oil gallery plug is not as easily installed because it is a very tight area to work in with all the hoses running through that area, even with the intercooler off. On my '04 WRX I had more room to work with in that area and actually used the oil gallery plug. I've done it both ways and both ways work just as well.

I do want to mention that it will make life a lot easier to run the wires through the firewall insulation if you have a cable puller with a little gripper claw in the front, or you can even use a wire coat hanger and some tape to tape the ends of the wires to it to push/pull the cables through to the interior.

Drilling the exhaust manifold for the EGT sensor is fairly easy, you just need a good drill bit and tap (I used an Irwin Turbomax 21/64" bit and their 1/8 NPT tap) and it also makes life a little easier if you have a drill press or access to one. You can still drill it by hand if it's all you have, you just have to be more careful to keep the hole straight. Contrary to what some may think, you do not need to use cutting oil on the manifold as you drill. With just a good, sharp drill bit and smooth, easy pressure with the occasional rest and backing out, the manifold will be drilled in no time. Cast iron has a high carbon content which acts as a lubricant as you drill.

I'll post some additional pics of my install as soon as I can so you can see how I mounted my sensors and ran my wiring.

Last edited by DTECH-WRX; 07-28-2006 at 10:40 PM.
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Old 07-28-2006, 08:35 PM   #17
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Quote:
Originally Posted by Doctor Subie
Nice detailed wiring pictures, I'll definitely be referring to this thread when it comes time to do my own setup! Thanks!
Thanks Doc! I'm glad I could share it with everyone.
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Old 07-30-2006, 01:30 AM   #18
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Quote:
Originally Posted by DTECH-WRX
Thanks Doc! I'm glad I could share it with everyone.
I'm about ready to order up my gauge setup, and wanted to ask you a few ?'s:

1) Can you really see the boost gauge when mounted up in center console? I was originally just going to put it there, but thinking about it, would it be better in a steering column pod (like ATI's 2 gauge steering pod)? I dont' know if a 60mm pod there would be too big. Currently, I have the irritating stock STI boost gauge there...

2) How is your defcon held in place? Velcro? I was thinking about mounting mine in the little center glove box...

3) Excuse my noobness, but is the EGT probe put in on the up-pipe, downpipe, or headers? I was going aftermarket APS TBE and possibly headers, and I believe they may have an EGT bung drilled in, not sure...I'd hate to drill my own...

4) Oil temp. or oil pressure? Sorry if this was covered before...I was also going to go EGT and boost for the other 2...
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Old 07-30-2006, 02:40 AM   #19
DTECH-WRX
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Quote:
Originally Posted by Doctor Subie
I'm about ready to order up my gauge setup, and wanted to ask you a few ?'s:

1) Can you really see the boost gauge when mounted up in center console? I was originally just going to put it there, but thinking about it, would it be better in a steering column pod (like ATI's 2 gauge steering pod)? I dont' know if a 60mm pod there would be too big. Currently, I have the irritating stock STI boost gauge there...

2) How is your defcon held in place? Velcro? I was thinking about mounting mine in the little center glove box...

3) Excuse my noobness, but is the EGT probe put in on the up-pipe, downpipe, or headers? I was going aftermarket APS TBE and possibly headers, and I believe they may have an EGT bung drilled in, not sure...I'd hate to drill my own...

4) Oil temp. or oil pressure? Sorry if this was covered before...I was also going to go EGT and boost for the other 2...

1) Having the boost gauge in the center clock pod area is not a problem at all. It's not like you are going to stare at it for extended periods of time. Most of the time you won't be looking at it except when you are really getting on the gas, and even then glancing over is not a problem. You can even pick it up with your peripheral vision and get a good idea of where your boost is without directly looking at it after you get used to what position of the needle relates to what PSI.

2) My Control Box has double sided tape that came with the Defi gauges on the back and is pressed against the side of the console. No permanent alteration necessary and you can always remove it easily if you need to. Velcro could work, but it wouldn't be as secure.

3) In the headers / exhaust manifold on the driver's side is the preferred location by many, myself included. Make sure you drill right on the casting "button" on the side of the manifold facing out toward the tire for best clearance and wire routing.

4) Oil pressure is best IMHO as far as warning and helping protect the engine as much as possible from catastrophic and slow leak oil loss.

I'll be posting some pics in just a few minutes.
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Old 07-30-2006, 02:54 AM   #20
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Cable puller. Greatly helps to easily get wiring through tight spaces for proper routing.



Tightly wrapped double-sided tape for keeping your gauges in place and avoiding vibration noise, both in one shot, is a little trick I came up with.



Drilled and tapped driver's side manifold. "Best spot" is right on the casting button on the side facing the wheel for best clearance and cable routing.



7/8" Hole saw used to cut the heat shield.



Proper depth for EGT probe. Be careful when taping the hole that you test fit the probe as you go to avoid going too deep or too shallow. The probe tip should be right in the middle and the end of the threaded EGT bung should end up flush with the inside of the manifold wall.



EGT probe installed, manifold installed, and heat shield installed.
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Old 07-30-2006, 02:54 AM   #21
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Sensor placement and wire routing.



Oil sensor installed into oil filter sandwich adapter.



Finished product!
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Old 07-31-2006, 12:36 AM   #22
Doctor Subie
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Very nice pics D-Tech! This is worth a million bucks! Thanks for your explanations and pics, this should help me a ton!
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Old 07-31-2006, 11:56 AM   #23
smac
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Quote:
Originally Posted by DTECH-WRX
Sorry I haven't posted sooner but I'll try and answer everyone's questions...

ecliptic: Sorry, but I haven't found a way to eliminate using the clock cluster to eliminate the dash airbag light. It really isn't a big deal though. You really do forget about the clock/airbag light once it's in there and if you wrap it up like I did you will get no rattling or annoying vibrations. Sometimes the simplest solutions are the best ones.

smac: The gauges will come with everything you need except for a few things you can improve on IMHO like the squeeze connectors and using a different technique for securing the gauges to a triple gauge pod. Also you will want to make sure you have either the Subaru oil gallery plug which screws into the engine block just below the intercooler and throttle body (sensor screws into oil gallery plug) or do as I did and use an oil filter sandwich adapter to run your oil pressure sensor to (I used the Greddy). On the STIs, especially on the '06 from what I've seen, the oil gallery plug is not as easily installed because it is a very tight area to work in with all the hoses running through that area, even with the intercooler off. On my '04 WRX I had more room to work with in that area and actually used the oil gallery plug. I've done it both ways and both ways work just as well.

I do want to mention that it will make life a lot easier to run the wires through the firewall insulation if you have a cable puller with a little gripper claw in the front, or you can even use a wire coat hanger and some tape to tape the ends of the wires to it to push/pull the cables through to the interior.

Drilling the exhaust manifold for the EGT sensor is fairly easy, you just need a good drill bit and tap (I used an Irwin Turbomax 21/64" bit and their 1/8 NPT tap) and it also makes life a little easier if you have a drill press or access to one. You can still drill it by hand if it's all you have, you just have to be more careful to keep the hole straight. Contrary to what some may think, you do not need to use cutting oil on the manifold as you drill. With just a good, sharp drill bit and smooth, easy pressure with the occasional rest and backing out, the manifold will be drilled in no time. Cast iron has a high carbon content which acts as a lubricant as you drill.

I'll post some additional pics of my install as soon as I can so you can see how I mounted my sensors and ran my wiring.
Do I all ready have this oil gallery plug or do I need to order this plug? Or If I was to go with the sandwich filter, wherer did you order your from? Thanks for this write up it is awesome...
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Old 07-31-2006, 12:08 PM   #24
Doctor Subie
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Quote:
Originally Posted by smac
Do I all ready have this oil gallery plug or do I need to order this plug? Or If I was to go with the sandwich filter, wherer did you order your from? Thanks for this write up it is awesome...

There are sandwich adapters from Maddad, among others, but I know Maddad sells one for ~$50, which seems like the going rate for those.
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Old 07-31-2006, 12:10 PM   #25
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Quote:
Originally Posted by Doctor Subie
There are sandwich adapters from Maddad, among others, but I know Maddad sells one for ~$50, which seems like the going rate for those.
And the oil gallery plug?
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