Quote:
Originally Posted by nelbur
Use the mechanical gauge for confirmation, but I also think the problem is electrical. You could have problems on the gauge end of things. Perhaps acceleration is causing the wiring harness to move affecting the connection at the instrument cluster. It might be good to use some electronics contact cleaner on the plug at the cluster.
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X2 confirm with mech gauge that it is not actual oil pressure problem. Accelerating in reverse does not lower oil pressure makes no sense so good bet it's electrical. Check supply voltage to sender and gauge for abnormal swing when reving engine to 2k rpm. Swing should not go past 13.8 v or so. The gauge circuit is suppose to be a bridge from what I have read that is immune to voltage fluctuations. If there is some wiring faults, the bridge no longer functions correctly and could produce strange readings. Check, clean and tighten the elec connections including grounds for the sender and gauge and see if that fixes it.