Thanks for all the replies. I guess I should have clarified the situation.
The '53 chevy truck was already on 12v. when I bought it. I don't know and the previous owner did not know about the generator, whether it was changed to 12v. or not. He claims he never had problems with dead batteries but then he parked it in the early '90s. I rewired it because a lot of the exposed wiring insulation was failing and I upgraded to more modern turn signals that did not require 2 bulbs at the rear of the truck at the same time on both sides like the original seemed to need.
About the only thing I have not got on 12v. is the fuel gauge. (The last guy just ignored it and kept plenty of fuel in the tank.)
Napa sold me a VT6187 voltage reducer. The instructions say to install 1 reducer for 1 amp draw at 6v. 2 for 2 amp draw, so forth up to 4 amps. Start putting them in series/ parallel to get current up to 8 amps.
I wanted to know ballpark amp draw on the 6v gauge, say at mid range/half full of the resistor in the tank, understanding the error in the gauge would multiply in both directions the farther the fuel level was from that point.
The service manual I got for the truck was not very helpful. It said to use GM part number xx fuel gauge tester to test the fuel gauge. A range of ohm readings for the sender would have been helpful.
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