changed oil pressure gauge worked for awhile, but oil pressure dropping again
There is a screen just under the oil pressure sender. Did you clean or change that? There is an o'ring where the oil pickup pipe connects to the oil pump and sometimes on higher mileage LS engines it deteriorates and causes oil pressure problems. Oil pan removal is required to access this o'ring. It would be best to measure the oil pressure with a mechanical gauge after cleaning or replacing the screen under the oil pressure sender. Then proceed from there.
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