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Old 11-25-2008, 05:46 AM   #1
Vince F
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Default connecting oil temp and pressure guage

I want to install an oil temp and a pressure guage in an 07' 2.5i. I have a set of guages, water temp, oil press, and ampmeter. Figure I can use the water temp for oil. Read about locations to connect them, and thinking of a Tee on the side oil gallery plug. The probe for the temp guage is 1 1/4", so guess I'll need an extension on a Tee, and metric threads. I want to keep the light, and figure run the guages off the Tee at another location, so I don't have to put a Tee on a Tee. Any ideas where to get the fittings? The water temp probe has a collar on it and to get it off will have to cut the wire if the threads aren't right.
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Old 11-26-2008, 12:57 AM   #2
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Someone correct me if i'm wrong, but I would want the temp for the oil in the pan (somewhere the oil is circulating, giving a more accurate reading). As far as pressure, you can fab up a "T" with the correct fittings, in the galley plug (where the factory idiot light gets it's reading).



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Old 11-26-2008, 01:08 AM   #3
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I'd rather not mess with the pan location. Any ideas where to get fittings, like Pep Boys, or Home Depot. Ordering on line might be tricky with the different standards.
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Old 11-26-2008, 02:05 AM   #4
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What are the threads on the sending units you have?

I agree with ballitch that putting an oil temp sending unit into a stagnant bit of piping is pretty worthless.
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Old 11-26-2008, 12:49 PM   #5
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don't know what the threads are, and not familiar with threads, which is why I'd want to try ones and match them myself. I have a set of guages I bought many years ago.

Are you guys sure the oil doesn't flow past the block locations, and how long would it take the heat to conduct through the oil to the sensor, and why wouldn't it reach what it is, if there was no air flow over the location?

Anyone know if the color of the A pillar housings matches the interior trim color?
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Old 11-26-2008, 03:01 PM   #6
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I have an oil temp and pressure guage in my 07 2.5i. I ordered a fitting from subaruwrxparts.com for 11 dollars but you def wont be done there. You'll need to remotely locate the sending unit via an oil line extension made by sunpro or some other company. Go with the copper tubing I've heard of the plastic ones cracking and making a mess. Mind you this is not going to be an easy task unless you have midget hands or you enjoy disassembling your 07s intake manifold. The gallery plug is located just under the throttlebody...not fun. You will need to put a tee in the fitting you got online in order to have two guages run off that one location. Make it a day project and take your time . Hope this helps



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Old 11-26-2008, 03:25 PM   #7
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I was thinking of a copper line, since I don't need any leaks. Does the engine movement make the guage move? What do you think of the temp readings from that location? I mainly want it to tell me when the oil is up to operating temp.

Don't look forward to messing with the intake. Just had a tussle with an ignition switch down on the column, under the dash of an old Chevy, so have worked in tight places. Will have to check it out.
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Old 11-26-2008, 03:52 PM   #8
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Best bet would be to pick up a sandwich adapter from any vendor here and whatever thread adapters necessary from McMaseter-Carr.com. My Defi sandwich adapter needed thread adapters for my Defi oil temp/pressure senders in order to work. It doesn't lower the oil filter a heck of a lot, keeps things out of the way as well as provides an excellent location for both sensors to provide optimal readings.

What brand gauges do you have? The probe for the temperature sensor sounds huge.

Pressure can be read anywhere there is a "hole" for the oil system. Pressure should be the same throughout the system. Temperature needs a good circulation point to give readings that are representative of the oil system.
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Old 11-27-2008, 03:04 AM   #9
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Looking for a place to mount the guages. I don't like things in my field of view that distract me, and don't want to loose the clock on the dash, and the A pillar pods seem like they would be in my face. Looking at the bin under the radio as the best spot, but it makes the opening a bit too small. Anyone know how to get it out? Guess the face plate around the radio will have to come off.
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Old 11-27-2008, 09:15 AM   #10
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there is a aftermarket bezel taht replaces the trim around the gauge cluster to add two small gauges in the lower l/r corners. they look almost stock, dont use any space that was previously used, and aren't in your face. heres a link...

http://www.autometer.com/cat_mountsd...=1&mdl=34&gw=0

Axis made his own version, with the pods positioned slighly higher.. makes them more visible while driving. takes some time and skill, though.
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Old 11-27-2008, 04:10 PM   #11
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Nice piece...

Thanks..
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Old 11-27-2008, 08:56 PM   #12
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Quote:
Originally Posted by AJ711 View Post
Best bet would be to pick up a sandwich adapter from any vendor here and whatever thread adapters necessary from McMaseter-Carr.com. My Defi sandwich adapter needed thread adapters for my Defi oil temp/pressure senders in order to work. It doesn't lower the oil filter a heck of a lot, keeps things out of the way as well as provides an excellent location for both sensors to provide optimal readings.
That's exactly how I did things initially - a sandwich adapter with press and temp sending units.

Quote:
Originally Posted by AJ711 View Post
What brand gauges do you have? ...
Pressure can be read anywhere there is a "hole" for the oil system. Pressure should be the same throughout the system. Temperature needs a good circulation point to give readings that are representative of the oil system.
If we knew what brand they were we could pretty easily figure out what the threads are, which would then allow you to buy the right adapters without having to blindly test.

Quote:
Originally Posted by Vince F View Post
don't know what the threads are, and not familiar with threads, which is why I'd want to try ones and match them myself.
Bad idea. Chances are they're 1/8" NPT or 1/8" BSPT, which are close enough that you could thread an NPT adapter (which you could find at Home Depot) onto a BSPT sending unit. However, the mismatch won't actually seal properly, and you could damaged the threads.

Quote:
Originally Posted by Vince F View Post
Are you guys sure the oil doesn't flow past the block locations, and how long would it take the heat to conduct through the oil to the sensor, and why wouldn't it reach what it is, if there was no air flow over the location?
I now have my temp sending unit threaded into the plug in the top of the block (the one below the throttle body referred to above in this thread). It seems to track with changing oil temps just fine. However, it is directly mounted in that plug, not in a T that would position the sensor out of the flow of oil.

Pat
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Old 11-28-2008, 12:13 AM   #13
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The brand is Lumen, bought Many years ago, maybe 25. No info comes up in a search, except a used one for sale on Aussie Ebay.

The set has fittings, and 2 for the temp guage that the collar on the probe would screw into if it doesn't fit into the block, are different size and type of threads. One with coarse threads is 21mm dia, and the one with finer threads is 17mm. The collar on the probe is 15mm, and threads look like the threads on the finer threaded fitting.
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Old 12-01-2008, 05:17 PM   #14
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Quote:
Originally Posted by gregp07h4 View Post
I have an oil temp and pressure guage in my 07 2.5i. I ordered a fitting from subaruwrxparts.com for 11 dollars but you def wont be done there. You'll need to remotely locate the sending unit via an oil line extension made by sunpro or some other company. Go with the copper tubing I've heard of the plastic ones cracking and making a mess. Mind you this is not going to be an easy task unless you have midget hands or you enjoy disassembling your 07s intake manifold. The gallery plug is located just under the throttlebody...not fun. You will need to put a tee in the fitting you got online in order to have two guages run off that one location. Make it a day project and take your time . Hope this helps



greg

Looked for the locations to mount the senders. Found the one near the Alternator, but not sure I found the one under the TB. There is a plug but it is pretty far under it, towards the pass side. Don't know how anyone could get to that one without pulling the intake. Maybe by spring when I plan to do it I will get braver.))
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Old 12-01-2008, 05:22 PM   #15
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wouldn't it be easier to go to a machine shop to have them cut matching threads? Maybe buying that adapter to fit in the block, and then have them make the collar on the temp sender fit or adapt to it.
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Old 12-02-2008, 08:54 AM   #16
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Quote:
Originally Posted by Vince F View Post
I was thinking of a copper line, since I don't need any leaks. Does the engine movement make the guage move? What do you think of the temp readings from that location? I mainly want it to tell me when the oil is up to operating temp.

Don't look forward to messing with the intake. Just had a tussle with an ignition switch down on the column, under the dash of an old Chevy, so have worked in tight places. Will have to check it out.

Sorry for the delayed response Ive been busy. The gauges do both read rather well. It does however take some time for the temp gauge to get up there. I think its accurate. Copper lines are the way to go. The guage is electronic so the sending unit itself is attached to the copper line lol.

Greg
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Old 12-02-2008, 09:01 AM   #17
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Quote:
Originally Posted by Vince F View Post
Looked for the locations to mount the senders. Found the one near the Alternator, but not sure I found the one under the TB. There is a plug but it is pretty far under it, towards the pass side. Don't know how anyone could get to that one without pulling the intake. Maybe by spring when I plan to do it I will get braver.))
NOT FUN man All I got to say about that. There are two plugs the one that you are talking about under/near the alternator and the one I used by the throttle body. The #1 issue with those plugs is space for the sending unit. That is why you need to remotely locate it via the copper line. Essentially you could probably use either one but I know the one by the throttle body is compatible with oil pressure and oil(we'll call it block temp because the sensor is on the block) temperature.

Greg
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Old 12-02-2008, 04:56 PM   #18
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I have heard it can take 10+ min for the oil to get up to operating temp, so maybe the time is normal. I was thinking about space, guess it depends on the fittings and senders. If the guage is electronic, why would it use a copper line, wouldn't it send through wires?

I was thinking of going with the alternator location, to avoid the hassle of the TB location. Looks like a fair amout of room. The fittings for the nylon tube for my pressure guage don't hold the tube very well. Thought maybe I could use them for copper, but it doesn't have the barrel shapped ferrel like copper usually does. Saw a copper line and fittings from one of the guage sellers, so will pick that up, but getting the right sized fittings and threads may be a hassle. Don'r see the Lumen guages I have listed anywhere but by a seller on Aussie Ebay, and it was an old one.
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Old 12-27-2008, 06:53 AM   #19
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Quote:
Originally Posted by gregp07h4 View Post
Sorry for the delayed response Ive been busy. The gauges do both read rather well. It does however take some time for the temp gauge to get up there. I think its accurate. Copper lines are the way to go. The guage is electronic so the sending unit itself is attached to the copper line lol.

Greg
Don't think I really understood what you were saying, but I ordered up an electronic oil pressure guage, and the sender looks big, and with the space in the locations, to put the 2 oil guage senders, and the light I want to keep, I think a copper line extension is going to be the way to go to connect something. Maybe the light and or El pressure guage sender. Have to see when I get the sender. Thinking about the filter sandwich adapter also as an option. Wonder if that has metric threads?

VF
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Old 12-27-2008, 08:19 AM   #20
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If not I have some adapters that I thought I needed sitting around that I'll give you for next to nothing. I put mine in the two gallery plugs on the top of the block. The temp sensor is in the rear one an it isn't to bad to get to but you may have to remove a few things, easily a 45 min job
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Old 12-27-2008, 03:05 PM   #21
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using both plugs may be a way to go, if I don't have to remove the intake. Did you chuck the light, or T it with the pressure guage?
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Old 12-27-2008, 03:08 PM   #22
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was reading there is a yellow teflon tape that resists oil and gas. Might not matter much squeezed between the threads, but maybe in time. I may have used the white tape on a fuel line to the carb on my other car.
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