1968 Dart gauge help

John Stapleton said

Thanks for all the answers you guys! I did wonder about your about answer#5 67Dart273.
I did try to loosen the 3/8 top nut holding the red wire and it wanted to spin and was somewhat loose/wobbly.I had to use 2 wrenches to back off the top nut. Could that be the issue? A possible broken internal stud! Also, where are the insulating washers supposed to be?

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The two ammeter studs must be isolated from the cluster housing, so there must be one on the inside and one on the outside. Normally, those have one washer with a ?? step that centers in the hole. As I said (I think) earlier, with wires disconnected from the ammeter, check for continuity from the studs to cluster ground. They should be open to ground. The ammeter is in series with the hot feed

"If you must" you can bypass it for testing or whatever. Just get a small machine screw, bolt the black and red ammeter wires together, and tape them up.