IVR pulse at 4 volts gauges read low

inertia said

I'm suggesting that if your reading "about 4vdc" at battery voltage of 13v or likely less,, then running,, it's gonna be closer to 5v..

Being factory guages,, they are more "indicators" than true, dead-on measurements..

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Got you on the quality.

I took all readings with car running and the idle set to 1000 RPM. Last time the car was roadworthy the gauges all read much higher than they do now (over25 years). I have about 35-40lbs of oil pressure at idle and the gauge used to read about 1/2. It only reads about a 1/4 now. I removed all the aftermarket gauges on the restore and do not want to put them back in even though they were much more accurate. I used to run them in tandem and they seemed pretty close only slower to re-act.