Then there is the concept of a native 12 volt gauge and sending unit. If you told your gauge rebuilder it is for a 12v system, they make the gauge 12v so there is no conversion. I have two sets that were done this way. 6 volts are not even a thought in that case. I like that because there is no resistor, no muss, no fuss.
There are two thought processes. One 'is comprised of' the thought that 'we need to get that 6 volt system to work with 12 volts'
The other is, its a 12 volt system. How about we just hook it up and expect it to work. I have been there, done that so many times. With 6 volt systems involved, things get complicated. If you understand advanced electronics, resistor conversions work, but are not optimal. Optimal enough for our old trucks for sure, but they make entire gauge sets for our trucks that are NATIVE 12 volts. Thats what I am doing without a doubt.
