Oil Pressure Gauge & Sending Unit Test: 190E
- Vehicle has a manual type oil pressure gauge. If gauge is inoperative, remove gauge's oil capillary tube fitting from engine oil filter housing. Install a known good manual oil pressure tester gauge.
- Start engine and check for oil pressure. If oil pressure is present on tester gauge, check original oil pressure line from engine to gauge for blockage. If no blockage exists, replace oil pressure gauge. If oil pressure is not present on tester gauge, replace oil pump.