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Old 03-06-2013, 10:26 PM   #1
CrazeePolak
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Member#: 279758
Join Date: Apr 2011
Chapter/Region: Tri-State
Location: Stroudsburg
Vehicle:
2011 Subaru WRX
WR Blue

Question Boost Gauge Install

Hey I have 2011 wrx hatch and I purchased the an AEM ***********30-4406 boost gauge and I ordered a 52mm universal mount that tilts and rotate 360 degrees which uses a double sided sticky adhesive so I don't have to drill holes anywhere. I've looked at all the DIY install videos and basically understand the install. But I have a few unanswered questions. According to my instructions all I have to do for wiring is +5V turn on and Ground.

I wanted to know do if I could wire this into the dimmer circuit so that the gauge could dim with the rest of the dash.

I'm installing the gauge in the OEM spot where the SPT would go as well so where do I run the wires through? Through the vents at the bottom of the windshield? Or do people drill holes somewhere into their dash?
Thanks
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Old 03-06-2013, 11:14 PM   #2
akalj
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Join Date: Jan 2006
Chapter/Region: MAIC
Location: Ashburn, VA
Vehicle:
2008 Subaru WRX STI
WR Blue

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Going to try to answer some of your questions. See below in red.

Quote:
Originally Posted by CrazeePolak View Post
Hey I have 2011 wrx hatch and I purchased the an AEM ***********30-4406 boost gauge and I ordered a 52mm universal mount that tilts and rotate 360 degrees which uses a double sided sticky adhesive so I don't have to drill holes anywhere. I've looked at all the DIY install videos and basically understand the install. But I have a few unanswered questions. According to my instructions all I have to do for wiring is +5V turn on and Ground.

Should be +12V turn on and ground, NOT +5V. According to the instructions for the 30-4406 unit, the +5V is an output (not an input). So don't put power on this wire (the white one) or you "might" fry the gauge. I suppose this wire is to collect the data from the gauge/sensor and output it somewhere else other than the gauge itself (i.e. logging or something).


I wanted to know do if I could wire this into the dimmer circuit so that the gauge could dim with the rest of the dash.

Usually the gauges that have dimming feature, would have circuitry internal to it along with separate cable or something that would allow to accomplish dimming. I do not believe that by connecting the red (+12V) wire to your car's dimmer circuit would provide you that (I could be wrong here). Usually you would connect this wire (red +12V) to a switch 12V source. I would recommend using a DMM to measure voltage in your fuse box (the one inside your car under your dash, not the engine compartment one) to figure out which source would provide you switched 12V (that is that only when you put your key and switch to on/Acc you would get ~12V in your DMM. Again, I am not sure how the gauge would react with the kind of voltage (not sure if it would even be 12V) from the dimmer circuit.


I'm installing the gauge in the OEM spot where the SPT would go as well so where do I run the wires through? Through the vents at the bottom of the windshield? Or do people drill holes somewhere into their dash?

No need to drill holes on metal. Look at the firewall from your engine compartment, you should be able to find some rubber like caps (firewall grommets). If you open one of these, you would have access to the inside of your car. You can either move it out of the way, remove it completely (not recommended) or make a small hole (enough to fit your boost hose) and run the hose from your T (the one that you would have to connect to your boost line) to your gauge.

Thanks
I hope this helps.
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Old 03-06-2013, 11:42 PM   #3
CrazeePolak
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Member#: 279758
Join Date: Apr 2011
Chapter/Region: Tri-State
Location: Stroudsburg
Vehicle:
2011 Subaru WRX
WR Blue

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Thanks that clears a some things up but I am aware of the rubber caps in the firewall that can be removed for that wire. What I meant is the wires that will eventually connect to the back of the gauge. Where to people run those? Like through the heating vents or something? And my mistake with the +5V lol, I definitely meant +12V I forgot im dealing with a car battery. I'm gonna test a few spots in the fuse box and see what I can use then.
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Old 03-06-2013, 11:47 PM   #4
C3hutson
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04 STi
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Look at the SPT boost gauge instructions and just tap into the 12v power source that they use with their plug and play connector
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