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I found on a site not corvette, that to convert anything over to HEI you needed to chase the "PINK" coil wire back the fuse box on the firewall. Then I read on this site, of some guys with 74's chasing the same coil wire, but they described it as black with a pink stripe. I can find no such black wire on my 74. The engine compartment on my car was gutted when I got the car and wires are dangling everywhere. I did find a solid pink wire that ran through the loom to the fuse box at the firewall. Could this be the coil wire that needs replaced for 12 volts?
I have seen pics of forum members cars with tachs/gauges that fit in the original clusters, so it is an option
You just need to do a little searching... Thats providing you care where the gauges are installed
to power the HEI you can run a wire to the HEI from the fuse panel. there's a terminal that is "hot" when the key is in the on position and in the crank position. i forget which terminal it is, but i can go look if you can't find one.
for a tach, i run a '75 tach in my '71. had to get power and ground from the harness, and run a wire to the HEI tach terminal. bolts right in, but the face is slightly different from the speedo.
The pink wire you want is on the ignition switch. Splice into the pink wire near the switch by soldering a 10ga wire with shrink tube and running it through the firewall to the distributor.
Get a 75-77 tach with the proper face for your year. I think one parts vendor actually sells them that way for people who want to get away from cable-drive tachs.
I have seen pics of forum members cars with tachs/gauges that fit in the original clusters, so it is an option
You just need to do a little searching... Thats providing you care where the gauges are installed