Oil Pressure

I have a 2004 Western Star with a C15 MBN motor w/800k miles

My question is:

My oil pressure stays at around 60psi while driving, but flux's and bounces between 58-62 as you watch it. I have a mechanical and a digital gauge and here is how it goes. As I drive down the the road, it goes 63, 58, 59, 61, 58, 63, 57, 59.... it does the same thing when I'm parked withi the idle bumped up. it has done this for over a year now. I'm not sure if it is maybe just the sensor is bad, or is it needing maybe some new mains put in?? I had it at Peterbilt for an overhead adjustment and the mechanic said everything looked great up top and was super clean. No signs of wear at all, and every oil sample comes back perfect. It burns no oil at all between the 25,000 miles I put on it for oil changes.

 

Yeah, it's an electronic gauge, just analog style. I said the wrong thing..... I'm going to change the sensor and see if it goes away. I was just wondering if anyone else has the same thing with their trucks. My FLD and an ACTUAL mechanical gauge and never did this, so it's new to me.

If the sensor doesn't fix it, I would think the oil pump was maybe going bad??? But I need to start with the cheapest thing, and I know that. Just looking for comments on others trucks gauges.

 

Oh, a failing oil pump will cause the same thing I am experiencing. I've had it happen before, as the teeth wear down, the pump starts slipping which causes it to lose pull (suction) in the pan.