My 64 dodge has a factory amp meter. I think the stock alternator was like 36amps ?? I'm installing a 90 amp alternator. How would I bypass the factory amp meter , since all of my power in the truck is run through the amp meter ? I would like to convert that gauge to a voltmeter (if I could find one that looks stock in the gauge cluster). But until then, I'll have to use a under dash volt meter.