Low pressure in gear
Correct me if I'm wrong but didn't you say a mechanical gauge has already confirmed your dash gauge was working correctly? So why are chasing down a way to make the dash gauge read differently?
I had the exact same problem you had and the lower end was wiped out. Guess what I noticed. The rods were "tight" but the bearings and crank were wiped out.
I have never heard anyone say their gauge was doing like yours and it turned out to be either the sensor or the gauge. Really low pressure when the idle speed decreases is a bottom end problem. Period.
You bought an engine on Craigslist? SMH
Pull a main cap.
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