could the valve cover gasket cause a loss of oil pressure you can see there is a leak from the driverside valve cover gasket? oil pressure is fine up untill about 1600rpm then it starts to drop
Sounds like your oil pump may be getting a little play inside. If its not the sensor or gauge and sometimes oil can cause a bad contact on the sending unit.
there is also a presure release in the oil pump that can get week.
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