Instrument cluster voltage regulator

For my 1964 & 65, I disabled the internal Vreg (slipped heat shrink over arm) and installed an adjustable electronic one on the rear of the cluster. Search "voltage limiter" and "Plymouth" on ebay. I paid ~$30. I had to tweak the Vreg setting and add shunt resistors across the fuel gage to get both it and temperature to read correct, using simulator resistors.