Instrument Voltage Regulator for 65 Dart
This is the limiter that I bought. I couldn't get it to work.
Meaning what? You couldn't figure out how to mount and wire it?
You did but it won't operate? If so how do you know it's the limiter, and it might be, or might not be
I would "rig" the limiter AKA wired temporarily, and then hook the output to an artificial load such as a tail lamp, and monitor the output with a meter to see if its regulating near 5V
The cluster/ limiter MUST be grounded to battery negative, and you MUST have a sender or test resistor on the sender terminal to ground.
What have you done to test the gauges themselves?
Bench testing rally gauges
There was an old thread--I cannot find--even applying a 1 1/2V battery directly to one gauge will provide some deflection.