Originally Posted by kerker
I havesame problem. Oil pressure gauge always remains high and fluctuates slightly. I am wondering if the guage is NFG Did u find out if your guage is the problem?
One of the problems with the Pontiac'* oil gauge, in my opinion, is that its voltage source is poorly regulated. There appear to be some resistances involved.... perhaps what we used to call "ballast" resistances, I don't know... but if any of them change their characteristics at all, it would look like the oil gauge would be affected.
Also: from the fuse, through the gauge and sensor, to ground, there are no less than 6 connections...not counting the connection at the fuse or the connection to ground.
If any one of them is corroded the gauge will be affected.
On my 94, the gauge fluctuates even before the car has started, after the self test cycle has completed. To me, this is more an indication of minor electrical problems, most likely in these resistances, or in corroded electrical plugs... rather than the gauge or sensor itself.
I have long ago abandoned hope of the Bonne providing an "accurate" oil pressure reading, and rely instead on what the "normal" characteristics appear to be for my particular car. I get worried where there is a change from these, rather than the actual value being shown.