2002 Chevy Silverado oil pressure gauge

Did you clean the screen below the oil pressure sender? After that install a manual oil pressure gauge in line, that was you can see what the actual pressure is, and if it drops like the electric one then you either have worn bearings that are letting too much pressure by or the oil pump is starting to fail.

Thanks for reply about to replace the gauge. Now the filter is the it behind the oil pressure switch or is it below the oil pressure switch?

It is underneath the oil pressure sender unit, it's about 1.5 inches tall, I would recommend replacing it if you get back there. But most people just clean it.

They did not start putting in that screen until 2007. Some of the 5.3L engines do have a oil pressure issue, which ends up being the oil pump itself. I believe it is in the front of the engine, and is a gear driven oil pump. As tennisshoes suggests, check the oil pressure with a mechanical gauge to verify oil pressure. May be just the Oil Pressure Sending Unit itself.