Fried gauges?

Mattax said

As far as measuring 5 Volts, not sure that can be done with a typical DVM. An analog voltmeter will show what's going on by the swinging of the needle

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Op mentioned he replaced the IVR I assumed electronic. Even with a mechanical you can see voltage on a DVM, at least on my 30+ year old Harbor Freight one. Displays erratic voltage readings but you know something is there.