not sure what the isssue causing oil pressure gauge to fluctuate. Installed new oil pressure switch then test drove for 20 minutes. The gauge did not fluctuate. Thinking the issue was resolved we phoned the customer to pick up the vehicle. She phoned about 30 minutes later and said the gauge was fluctuating again. I informed her the mechanic would not be at work again until after the weekend. She was give the option of leaviing the vehicle here until then or returning it on Monday. She deciced to have another repair facility inspect it. I have no control over her decision.