Originally Posted by 6XChevy
I have decided to go with the 12V gen. since the coil, points, etc. are already 12V. I will change to a 12V regulator and use ballast resistor on the fuel gauge and heater motor. After changing all the light bulbs, I should be good to go. Any thoughts or suggestions will be appreciated!
You might want to use a Runtz style resistor on the input side of the fuel gauge.

This resistor/reducer should work fine with 6v motors and other 6v accessories/options.