Back years ago after I did the the Kaiser/Chevy Swap, I started thinking about the instrument panel voltage regulator. John Parker had shown the stock unit (51-55 Kaisers) worked under 12V (KF Quarterly article). KF cars used King-Seely gauges and it was a reasonable assumption that early cars and HJs would work as well and they do. However, you could ponder how long a stock KF unit would last. I bought a dash regulator for a 1967 Dodge Dart (also King-Seely instruments) and tried it on a Kaiser. The response was slow. The gauge needles would move slowly between minimum and maximum values, e.g. if the gas tank was half full, the fuel gauge would slowly move back and forth between 1/4 and 3/4 full.
The stock KF regulator works properly and I know of only 2 instances where the regulator went bad and those were on 6V. If you change the car to 12V, use the original panel regulator and if the regulator actually goes bad, replace it with an original unit.
