I want to install things on/in my car like a turbo boost gauge and some driving lights but I don't know how to rout the lines from the inside through to the engine compartment. Is there a grommet somewhere on the firewall that I can get through? I briefly poked my head down in the foot wells of the front seats and couldn't really spot anything. I really want to get this boost gauge in (so I can get that boost controller that Speedy installed in his car). Thanks for the help

Alex

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside