Low Oil pressure light

[98whitelightnin]

Sometimes my oe oil pressure gauge drops to zero and I get a ding with a light. This usually only happens when I’m at a lower idle situation while pulling forward and the idle gets low or reversing into a parking spot and idle gets low (idle is set at 815). It’s only happened a handful of times until one day last week when we had a 75 degree day and then it was dinging every few minutes during slow driving or idling. When I bought this truck, a little over a year ago, original owner told me about this and had a new oil switch in the door but I put a new mopar switch in it anyway. Mechanical oil gauge I have shows 23 psi or so while the gauge in the dash drops to zero. Do y’all think this could be a wire or just nature of the beast. Also, cold start oil pressure seems to come up slowly but I’ve never had a mechanical gauge on any of my other cummins. I’m using 15w40 and it’s not low. 

[dripley]

Sensor for dash gauge going bad maybe? I dont how the 12v's read oil pressure.

[98whitelightnin]

The gauge seems accurate all times, except when it drops off.

[98whitelightnin]

This was the sample. I’ve had two 98 trucks and the first two samples were from it several years ago, but it also had a wix bhaf with good results so maybe I have something else going on

[Dieselfuture]

Did you have valve cover off at that sample interval. That could be why some dirt may be in there.

[98whitelightnin]

I don’t think valve covers were off anytime during that run.