normal oil pressure indicator position

[Jaquelyn Marilynn]

When the engine is not running and the ignition switch is turned on, the warning light illuminates. If the vehicle is equipped with a gauge there will be no indication of pressure. When the engine is started, oil pressure will compress the diaphragm in the pressure switch, opening the contacts and cause the light to go out or, in the case of a gauge, a positive pressure reading will be indicated.