What is a sign of a properly functioning oil pressure gauge?

A properly functioning oil pressure gauge is indicated by the warning light going out. This shows that the engine oil pressure is within the normal operational range. When the engine starts and oil circulates, the pressure builds up; if everything is functioning correctly, the oil pressure warning light will turn off, signaling that the oil pressure is adequate for safe engine operation.

A reading that consistently shows above 60 PSI may indicate too high of a pressure, which could be a concern rather than a sign of normal function. An oil pressure gauge indicating under 20 PSI could indicate low oil pressure, suggesting potential engine damage or failure due to insufficient lubrication. Fluctuating widely could indicate an issue with the oil pump or another problem within the engine's lubrication system. Therefore, the correct indication of a properly functioning oil pressure gauge is that the warning light goes out, confirming normal operating conditions.