Mechanical boost gauge installation on a '12 WRX sedan - Subaru WRX Forum
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post #1 of 6 Old 01-04-2017, 09:42 AM Thread Starter
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Mechanical boost gauge installation on a '12 WRX sedan

I'm having trouble trying to get through the firewall. I removed the TMIC and had a look around and I don't see an empty grommet or obvious place to run the vacuum line - nothing is jumping out at me. I figured out how I'm going to get power to the gauge but I'm hesitant to start drilling on the firewall without some opinions. Has anyone with a similar year put a hole in the firewall? Is there a recommended location? I'd like it to come out as close to the driver's side as possible.
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post #2 of 6 Old 01-04-2017, 11:54 AM
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I used a grommet behind the brake pedal. Mines an 05 tho

05 WRX Wagon - 409 AWHP / 334 WTQ Wicked Matt Tuned
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post #3 of 6 Old 01-04-2017, 02:30 PM
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Hey man, there is in fact a grommet by the upper engine mount behind the intercooler, next to where the ac lines are and the other harness that runs inside... believe it's slightly on the passenger side.

Here's a pic:
Same As Previous. Photo by lttiggity | Photobucket

Beware, you will have to punch through the insulation/carpeting but you'll be able to reach whatever you put in there by reaching behind where the center console meets the firewall under the dash (there's enough room to stick your hand in there and grab something).
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post #4 of 6 Old 01-04-2017, 09:15 PM
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there are several good videos on youtube that show you the whole process including where that hole is you are looking for, check them out
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post #5 of 6 Old 01-05-2017, 09:39 AM Thread Starter
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Quote:
Originally Posted by Ruso View Post
Hey man, there is in fact a grommet by the upper engine mount behind the intercooler, next to where the ac lines are and the other harness that runs inside...
Thanks, Ruso, that picture helped a lot. I saw the hole for the AC lines, but didn't see the one next to it.

After doing some research I think I found another hole that may work better. Supposedly there is a way to get it through a hole just above the dead pedal. Here is the quote from the forum post I found:

"To the left and above the dead pedal. This feeds up into the fender which has a ton of space to work in and is super easy to access and get up into the engine bay."

How do I get into the fender? Remove the wheel-well liner? Has anyone ever used this location?
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post #6 of 6 Old 01-05-2017, 12:34 PM
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Yup, I used that one for subwoofer wires. Remove clips on the fender liner towards door/sideskirt.
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