Repairing Temp. and Fuel gage Indication on a 1969 Dart Swinger 340

I’ve removed the IVR. Is there any way to bench test it? I’m getting continuity between all three pegs. There was a wire also stabbed into one of the holes with the tab. I think it was the ignition slot. Is this the 12v supply in? I tested wire with ignition on and didn’t get any voltage? Maybe wire feeding cluster has no power? Can someone tell me which each tab is? Introl tab/ignition tab and large tab on side? Thanks again.038AAFDA-CAEE-4CAC-AD9D-7BD76DA8D315.jpeg