V90 L6-2.9L VIN 96 B6304S (1998)
Oil Pressure Warning Lamp/Indicator: Description and Operation
The oil pressure sensor is located on the engine block and consists of a pressure gauge which closes a switch when the oil pressure inside the engine falls
below a specified minimum pressure in kPa. When the switch Is closed, a lead on the instrument panel is grounded and the warning light comes on.