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.