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I'm installing all new wires on my 50 chevy 3100. I'm using an original 6 volt type harness with the conversion harness to change to 12 volts with internal regulator. I'm installing the instrument cluster wires to the amp meter and the gas gauge. I know that with 12 volts, there will be less current flow through the amp meter but will this thing work for 12 volts? Also wondering if I need to do anything different for the fuel gauge?(I have a new tank and sending unit looks like it has one wire terminal connection spot on top of the sending unit. Third question in my mind; What fuse upgrades would be good to keep the possibilities of trouble out of the picture? I am using a fuse block like GM used in the mid 60s because I need to fuse the heater circuit for my oe heater I have added and fuses for a stereo system . Any suggestions would be appreciated. I don't want to smell melting wires!

6v to 12v conversion Tech Tip

Most people use a 12v to 6v volt Runtz-style reducer on the input side of a 6v fuel gauge.

I fabricated my own "Runtz" style voltage regulator/reducer. Do a search and it will surely come up with a photo or two. I also did as you and added a fuse block under the dash to handle the added accessories such as A/C, radio, PA system, and cigar lighter. Pic of fuse box, relay, and power/ground bus. The (30 amp) relay is energized from key switch which sends battery voltage to power bus (I did not want all the added load going through the key switch). Most critical electrical loads have dedicated ground to ground bus which is grounded directly to cab, frame, and battery.