Vacuum wipers don't care about the voltage.The oil and heat guages are mechanical, radio doesn't work I'm thinking about a 12 volt battery hooked to the starter only and leave the 6 volt system(with charging) intact..I would have to charge that 12 volt battery periodically..I picked up a 10SI alternator that looks like it might bolt right into the generator bracket but the car uses a 3/4" wide V belt.I would 3 wire it cause this old thing might make enoough RPMS to excite the alternator..lol Just trying to evaluate the options.Thanks for the opinions