Factory tach wire hole in firwall

[the 77]

does anyone know where to drill the hole in the firewall to run the wire for tach harness? It's an aftermarket harness with a grommet to run through the firewall.

 

[PrairieDrifter]

Just run it through the regular hole by the bulkhead.

 

[Edelbrock]

does anyone know where to drill the hole in the firewall to run the wire for tach harness? It's an aftermarket harness with a grommet to run through the firewall.

Well, that's up to you. I generally look for an exhausting hole that was put there by the factory to feed wires or linkages through the firewall. The the tach wire and be inserted through the existing hole. Wiring harness, steering shaft, throttle, etc. A drill works, or even a punch and sledge hammer. Other times, I just blast a random hold using a bullet, which is probably the quickest way to get the job done.