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Jerry: Here's how to make your 40 Ford BAT gauge read accurately when converting to 12V and using a one wire alternator (neg. ground).. You have to isolate the BAT gauge so it operates all by itself and install a 60 OHM resister in line from the 12V input wire to the gauge. See here.
https://www.fordbarn.com/forum/showt...olt+conversion