How do I route gauge wires thru firewall?

[sbelyo]

I guess this sort of a newb question. Sine I figured out that my stock guages and the autometer cluster is useless for oil pressure, volts, and water temp I want real guages.

I will use Autometer Phantoms (electric) with a triple full a pillar. I've seen the threads that show the location for the oil pressure sender, but I haven't seen the water temp location or volts.

My questions are:

1. I have no idea where to route the signal wires so I can get them to the pillar. I am assuming I have to go through the fire wall, so is there a preferred location to do that? And how big of a hole do I need? I'm also assuming the steel will be tough to drill through.

2. If there is only one location for the water temp sender and I disconnect the original will it trip an error code?

Thanks in advance

 

[Torinalth]

there are two wire harnesses that go through the firewall behind the drivers side dash, just crawl up under the pedals and take a look with a flashlight. if yyou are a big guy, just give up now and pay a kid to do it... seriously, its a tight space to get to without removing the dash.

when i ran the power cable for my amps i had to drill as there was no hole large enough for my size cable. i drilled above and to the right of the clutch pedal where it attached to the sheet metal. always drill a tiny pilot hole, just barely going through, and shine a flashlight through it to mnake sure you are not drilling into anything bad... like brake lines.

Torinalth

 

[sbelyo]

I'm a small guy... only 5' 6"

I'll take a look and see what I can see. I may just see what the local guy wants for installing the three guages

 

[showstopper2]

just take a flat head screwdriver and cut a hole in the harness grommet on the driver side firewall to pass the wires through. the wiring is not difficult but time consuming so you would pay a pretty good price to get it done.