Quote:
Originally Posted by Green993
One way to rule out the sender is by attaching an external pressure gauge at the sender and reading the pressure directly.
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I did that by removing the gauge sender and connecting a mechanical oil pressure gauge. The mech gauge showed that the old sender was indeed going bad and needed to be replaced, which I did. The mech gauge showed the same results, normal looking pressure at startup w/ decreasing pressure as the engine was running. Almost as if the increase of oil in the tank was related to the decrease of oil in the sump.