81+ tach wire firewall location
 

Does any one have any pictures or info on where the tach harness goes through the firewall on the 81-87 trucks? I found a pic for 73-80 and it looks like it is to the right of the cruise control hole in the firewall (from inside the cab). also, anyone know what size hole it is?

Re: 81+ tach wire firewall location
 

If you click on my 86 suburban link in my sig, I think the last page shows where I added the tach wire through the firewall. This wire and grommet came in the kit I bought from LMC with the tach conversion. I want to say the hole is half inch.

I think factory tachs were no longer an option after around 84? So an early 80’s truck owner may have to chime in.

Re: 81+ tach wire firewall location
 

My 87 has the factory tach.

(No pictures, though)

K

Re: 81+ tach wire firewall location
 

Keith I was hoping you'd post as I remember you talking about tachs many years ago. Does the picture I posted seem like the correct spot for the later squarebodies? There is a cut out in my firewall pad next to the cruise control hole, I am thinking this is the correct location...

Cortes, I found the pic in your suburban thread, thank you.

Re: 81+ tach wire firewall location
 

I'm not finding any pics and it's covered up right now, so I'll take a look next time the cover is off.

That does look correct, though. I'm keying off the shape of that grommet moreso than the location in my memory.

K

Re: 81+ tach wire firewall location
 

thanks Keith, keep me posted!