Plymouth Duster Instrument Cluster Wiring
I'll have to see if I can find my manual.
EDIT. Aw hell. Don't know what I was thinking. They are in boxes and I cannot lift them now. ====broken ribs. Sorry. The 76 cars wiring is much different that 73, which is the latest posted over at MyMopar. I'm not for sure but it might be the ammeter on those cars is external shunt. If you can access the rear panel, look for the ammeter. If it is two large studs and nuts, it is "full current" like the older cars. If it s board traces or smaller wires, then it is "external shunt."
If it is external you are going to have to "build" that to mimic what was in the original harness, or else convert it to voltmeter. There was a thread on here to do that on the older cars
Ammeter to Voltmeter...who does it?