So I recently bought a water-temp gauge, and I would like some suggestions on where some of yinz ran the wire/hose through the firewall into the interior of the car from the sending unit. It's a 75 4door i6 Maverick. Thanks!
If your car is a factory AC car, then it will have rubber plugs where the heater core used to be. You can run it through one of those holes.
I ran my gauge wires in a hole where the firewall insulation retainer button once lived. Use a rubber garment to keep the wire(s) safe.