Oil Pressure Gauge

Oil pressure gauge measures electrical current from variable resistance unit (oil pressure sending unit). Sending unit has low resistance when oil pressure is low and about 90 ohms resistance when oil pressure is high. A change in resistance changes current flow through gauge electromagnetic coils, moving pointer toward appropriate reading.

Sending unit locations are as follows:

• 4.3L, 5.0L & 5.7L At lower left rear of engine block.
• 6.2L At top left rear of engine block.
• 7.4L At lower left front of engine block.