Temp & fuel gauges - what am I overlooking?

Super-Cuda said
Hey 67Dart273,

Please correct me if I'm wrong here but wasn't the whole idea of the newer electronic IVR"s to provide a constant 5 volt output to the gauges even with fluctuations to the 12 volt input?

I built my own IVR and it works perfectly

. Steady 5 volt output. It takes longer for the gauges to respond on start up but that's the only issue and a very small one.

I do agree totally with your test procedure using resistors to simulate the sensors

I for one will use that test procedure in the future.

Cheers!

I think you missed what I was trying to say. Even the purpose of the old electromechanical IVRs was to attempt to regulate the gauges, as the actual 12V system voltage was going from BELOW12 on a cold, rainy, winter night, with heater, wipers, etc---to 14 and sometimes a bit above.