Good idea, Beltfed. Pathway, I'm in Gilbert. Send me a PM if you want to get together or talk it through.
Working from memory here, but I am pretty sure that the dash gauge output wire feeds everything except the direct feed from the battery to the starter. The headlight switch would be fed after the dash gauge, not before, with the stock harness.
I can show you how the same three wire alternator is hooked up to my '57 if you want. You can use that as a starting point. I have a copy of the stock wiring diagram in my manual.
Matt
