Dear Doctor: I have a 1997 Jeep Wrangler with about 83,000 miles. When warmed up and resting at idle the oil pressure gauge drops to 0 and the warning buzzer goes off. When engine speed increases the gauge registers normally again. I had the sending unit replaced and an auxiliary unit attached. There is plenty of oil pressure in the engine. I’ve been told the problem is in the gauge or the dash cluster. I don’t want to spend great amounts of money. Is there another place I should look, or should I just hook up an auxiliary gauge and forget the one on the dash? Brian
Dear Brian: As long as the oil pressure is at specification with a mechanical gauge then your engine is safe. I suggest you use a factory oil pressure-sending switch from the dealer. There are a few simple tests that can be done to see if the problem is in the dash cluster. Visit the Alldata web site for the way to check the gauge and actual voltage specs. You can also continue with the use of the aftermarket mechanical oil pressure gauge.