Aftermarket Tach install ?
 

I finally gave up and purchased an aftermarket tach conversion upgrade for my 72. It installed in the cluster gauge without cause or concern and looks great. I have two questions;
(1) Next step refers refers to using the existing 3/4" hole in the firewall or if you don't have this hole "DRILL IT". Problem is it does not say where this hole should be drilled to match factory placement.
(2) The supplied wiring diagram shows connecting the brown wire to the negative side of the coil with the supplied eye connector. I have an HEI distributor so I don't have this type of coil. My HEI distributor has a male spade connector on the cap for tach, so I assume I can cut the off the supplied eye connector and replace it with a female spade connector and connect as though I was connecting to the neg. side as coil?

If someone can post a picture of where this hole is in the firewall I would appreciate it and let me know how to connect to HEI so I don't damage my hard spent investment.

Thanks in advance.

Re: Aftermarket Tach install ?
 

If I remember correctly this " so I assume I can cut the off the supplied eye connector and replace it with a female spade connector and connect as though I was connecting to the neg. side as coil?" is what I did to my 68. Since I dont have the truck here I cant go out and look.

Re: Aftermarket Tach install ?
 

TTT
Still looking for a picture of firewall where hole should be. Please!!!Help

Re: Aftermarket Tach install ?
 

interested also, free bump

Re: Aftermarket Tach install ?
 

Hi treveiger

Another board member answered this question with pics on one of my other threads. Here's the link http://67-72chevytrucks.com/vboard/s...d.php?t=439292

Re: Aftermarket Tach install ?
 

Thanks!!! Did you get your tach working with your HEI?

Re: Aftermarket Tach install ?
 

I'm still working on getting it replaced so right now I don't have a second tach that I've installed. I've looked at several suppliers and some actually say that their tachs work with HEI and some say their's won't. I assume you bought a tach conversion kit. Where did you get yours?

Re: Aftermarket Tach install ?
 

No im actually looking for a tach from summitracing and want to make sure i get one thatll work. Im thinking about this but not sure it itll work...

http://www.summitracing.com/parts/SUM-G2907/

Re: Aftermarket Tach install ?
 

I put a Cyberdyne tach in my last cluster. I cut the housing down to actually fit inside the gauge cluster itself. The led sweep matched the factory markings on the glass. It was a really sweet install, I wish I had some pics. When the key was off it was a run of the mill dash, hit the key and the tach came to life. I plan on doing it again, so I'll take pics!
Posted via Mobile Device