Quote Originally Posted by junkyardjeff
I have found that a instrument voltage regulator from a mid to late 60s ford car or truck works well for all the electrical gauges except for the the amp gauge,12 volt ford gauges are actually 6 volts and use the IRV to drop the voltage. I used one from a 69 F100 on my 55 sunliner and so far its working and I think on your 28 the only gauge you will have to drop is the gas gauge as the temp and oil should be mechanical. Jeff
1960's and 1970's Mopars have 6v instrumentation, you can still get the regulators they use from the dealership parts counter