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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.
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