Aftermarket oil pressure gauge line routing through firewall

[KillerBee]

I'm going to run mechanical oil pressure and electric temperature gauges on my 71 R/T Challenger along with the factory gauges, at least until I can determine if the factory gauges work and are fairly accurate.

So where is a good place to run my plastic oil pressure line and my electric temperature gauge wire through the firewall without drilling any new holes?

Thanks.

[Moparal]

There should be a rubber plug where the 4 spd clutch rod would come through or the foot washer pump. Around the brake booster. I would use that some times. Or out the side of the speedo grommet plug.

[KillerBee]

There should be a rubber plug where the 4 spd clutch rod would come through or the foot washer pump. Around the brake booster. I would use that some times. Or out the side of the speedo grommet plug.

The car is a 4 speed so I can't run anything through where the clutch rod goes.

I was thinking of the speedo cable grommet and I do believe there is another plug over by the master cylinder(manual brakes)  but I'm not sure if my oil pressure gauge line is long enough.

[Chryco Psycho]

don't use a plastic line unless youy like hot oil showers !!
I always use copper .
 There is a large rubber plug near the hood hinge on the left side or sneak it through the speedo cable grommet

[high perf mopar]

mine goes thru the fire wall just to the right of the throttle cable.viewing from inside the car.using an existing hole.appx 1" diameter..used a factory rubber plug modded for thru hose access,,,steel braid line for the oil pressure gauge..u can get various lenghts from summit for the guage like i did,,something flexible but not delicate like plastic..   

[dougs bs23]

You could also use the holes where the grommets hold the firewall insulation. Just drill thru the grommet the size of your wire and oil line.