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I'm getting a boost gauge for my 97 900SE. What vacuum line should I tap? and I was told to look for a plug under the break peddle to route the tubing but I can not find it. Can I just drill through the firewall?
 

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No drilling needed. Peel up the driver's side carpet and look for a rubber grommet hole that's not doing anything. The firewall is flexy enough without another hole!

I think Eric (ERP) has a picture at his site...
 

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HNNLIC
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Actually, I never did find that grommet. I did however find the grommet used for the fuse box located under the hood. It was a tight squeeze and a true bitch to find.

That grommet was located high above your clutch pedal, I had to take the undersection of my dash out to get to it. I eventually got fed up with it, and ended up drilling my own hole for my positive battery cable to my amp.
 
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