The gauge failure posts cursed my car

Not sure that's true, Rob. "I've been told" that the original IVR was a 50% duty cycle

1V is quite a bit of the overall. That is 1/5 or 20%!!!!! If that were 120VAC you are talking about A TWENTY FOUR volt change!!!
Does a 50% duty cycle = 5v? I don't know how "all that" works out.