Oil Pressure Gauge

An engine instrument that indicates the pressure of oil circulating through the engine lubrication system, typically measured in pounds per square inch (PSI). Oil pressure is the first instrument a pilot should check immediately after engine start; if pressure does not register within 30 seconds in warm weather (or 60 seconds in cold weather), the engine should be shut down to prevent damage. Low oil pressure in flight is a serious emergency indicating potential engine lubrication failure, and the pilot should plan to land at the nearest suitable airport immediately.