Oil pressure

[JCW]

I'm sorta new to the diesel world have 99 cummins 24v the other day I was ridin down the road and oil gauge dropped to zero. I shut off pulled it home didn't want risk hurting motor. So I hooked a mechanical oil pressure guage to top oil filter housing and had 60lbs. So then i bought a oil pressure switch from dealer was 185$ installed it and guage still said zero. What else could be? Plug looked good and wires as well.Any help is greatly appreciated

 

[Dtruck1]

You need an oil pressure sensor. Unless you said switch and meant sensor. Gauge could be bad as well. You could find a gauge in a part yard and get it for cheap to verify you are getting voltage through your harness. If the junkyard gauge works, just R/R it with the defective gauge in the truck.

 

[JCW]

Yeah it was on the left side of block under fuel filter housing took 1 1/16 socket. When u say guage u mean the whole cluster?

 

[JCW]

Last nite started truck ran for about 15 min guage started workin and never messed up this mornin on way to work

 

[Dtruck1]

Intermittent problems are always the worst. You may have a wire shorting out or open, and yes, the sensor by the fuel filter is the right one. I had to replace the one on my 05 as well. And for future reference, it is very very seldom that you have an oil pump failure on a 5.9L. Not saying it won't happen, but very rare. If it does it again, check the oil level, and if it's good, you should be. I know on the common rails, the oil pressure isn't even an accurate reading anyway. It's a curve built into the ECM. Evidently, 60+ psi of oil pressure freaked customers out.