Ok, so I'm using a multi-meter (set to DC volts). Kind of a noob question, but should I be testing the wires or the circuits? and should I be testing them with the key in the ACC position or the ON position? Found the link below, which seems to explain what each wire is. So I'm hoping i can just test the wires specified in the links diagram, that relate to the gauges I'm having issues with? Is my head in the right place? Thanks!
https://forums.nicoclub.com/how-to-f...s-t526276.html