for those of you who have after market gauges where did you guys run the boost line through the firewall at?? thanks

 

There should be a gromment that is made of rubber that is on the firewall. Pock a hole through the rubber with a screwdriver and run the wire through there

 

I think he's talking about the hole down behind the brake pedal (may be the accelerator, don't remember). You should be able to run a hose through there too, but fishing it up to the A-pillar may be a bitch. I had a hell of a time with my wide-band wire's.