link1896
Mr Greenfield
Would be nice to think this is a sensor issue and not a true loss of pressure. Had a VDO gauge and sensor apart years ago, gauge was a basic current meter, the sensor changes its resistance to ground with pressure and there was no voltage regulator in the gauge, so it is susceptible to the battery voltage. I investigated this after a mate asked "why does my oil pressure drop when I turn on the spotties?"Try another gauge in it, it should be knocking like shit if it's going down to 0psi and the oil light should come on, most oil lights work when the pressure gets to under about 5 psi. It wouldn't hurt to change the oil and filter, check the oil pump and pump pickup. Failing that I would assume it has big clearances in the bearings.
Makes we wonder, what's the alternator/battery doing at idle? Got a good earth connection between block and battery?
Binner, can you tap in a mechanical gauge at the block for a sanity check?