If you can get a oil pressure tester set, you can find out for sure what the exact oil pressure is. If you don't have one you can rent one from an auto parts store. Simply find the correct fitting and screw it in. On the older 5.3 L test port is at bottom of where oil filter housing is. It can be the oil pressure sensor switch which is in the engine block or the sending unit itself or gauges etc. Test oil pressure with gauge first Sent from my iPhone using Tapatalk