Abstract: The present invention is adapted to sound an audible alarm if the operator of a motorcycle stops the engine with the shut off switch and leaves the ignition on. The alarm will sound once the oil pressure falls to 0 or below a predetermined level. The present invention is also useful for notifying the operator of a loss of oil pressure during operation, indicating either that the engine has stopped running, such as by stalling, or oil pressure has dropped below the minimum safe operating level due to a leak or mechanical defect. The invention is also useful during startup of a motorcycle to warn of a problem with the lubrication system. When the engine is started, the oil pressure audible alarm will sound until the engine oil pressure has exceeded the minimum pressure.