A warning light comes on at 11.5 volts. Tymate Tire Pressure Monitoring System. ... This 3-in-1, 12-volt-powered set features a voltmeter, water temp, and oil pressure gauge all on white faces.

When oil pressure senders fail we get no reading or maximum. The oil pressure warning light sender is a simple on/off switch. No oil pressure and the switch is closed, illuminating the warning ...