[greg64]

Greg, that's great that the fuel gauge started working again. If you're looking for something to do (ya right), you might want to pop that firewall connector block apart again, and clean all the contacts as best as you can on both sides. Unreliable wiring is no fun at all. I think a nail file will fit in there and clean crud off the female side. Emery cloth with small pliers should work on the male side. I think that's how I cleaned mine.

By the way, good on you to realize that ignition wire was resistance wire. It would have hurt the performance of the HEI if that were still there. when the engine is running, check that you have alternator voltage at the ignition coil. Should be 14.4V with your new wire. I was never sure on the early trucks if that resistance wire ended at the firewall, or if it went under the dash back to the ignition switch.