1963 Dodge Dart "Voltage Limiter"

Ok I didn't find a source for which gauge it's in but if you look at the back of the instrument cluster it will be the gauge with 3 studs sticking thru the back of the cluster. I know the 63 and 64 Valiant it's the fuel gauge. here are a couple of links for more info Early A-body Instrument Regulators

And a source for the best fix https://www.rt-eng.com/rte/index.php/RTE_limiter