Working on a 1965 C-10 that has gauges rather than lights. The amp gauge was never hooked up when the truck we rebuilt and a new wiring harness installed. Nor was temp gauge or oil pressure gauge.

I am trying to get all the gauges working to get rid of the under dash gauges.

I know on my 59 the amp gauge carried all the electrical load.

But seems to me the amp meter in 65 used a shunt.

Anyone able to explain simply enough to me how to get this gauge working? Or has anyone placed a volt meter in the instrument cluster?

Thanks