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

Cubzy said

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.View attachment 1715171785

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LOOK man PLEASE don't screw with that thing. Do yourself a giant favor and buy (or build) a solid state one............

The thing is 50 years old
The thing works like a turn signal flasher.......it constantly heats up, opens, cools down, re-connects......re heats up, opens, re-cools down, re-re-connec.........................get it? It's been doing this for 50 years

Basically you have THREE connections........switched 12V power in (with the condenser), flashing "regulated" power to the gauges, and a ground connection.

It is VERY likely "out of calibration" after all these years.

You can check the accuracy of the gauges individually by substituting a known resistance and comparing the gauge reading, this is "one version" of the old factory / dealer gauge tester