- GAUGE OIL PRESSURE ERRATIC 0R LOW READING VEHICLES BUILT BEFORE 10/01/87 Article No. 88-5-14 0 ENGINE OIL OIL PRESSURE GAUGE INDICATES ERRATIC OR LOW READING VEHICLES BUILT BEFORE 10/01 /87 LIGHT TRUCK: ISSUE: An oil pressure gauge that indicates an erratic or low reading when the engine oil pressure is within specification may be caused by the oil pressure sender. The oil pressure sender may not work prOperly with the magnetic oil pressure gauge. ACTION: To correct this, install a new design oil pressure sender and new design resistor wire assembly using the following service procedure. Refer to the oil pressure sender and resistor wire application chart on this page for the correct service parts. 1. Remove the existing oil pressure sender. 2. Install the new design oil pressure sender. Torque oil pressure sender to 1018 lbs-ft. (13-24 Nm). 3. Connect the female terminal end of the 20 ohm resistor wire assembly to the oil pressure sender, Figure 5. 4. Connect the male terminal end of the 20 ohm resistor wire assembly to the vehicle wire harness, Figure 5. 010280 1987-88 F-SERIES, BRONCO OIL PRESSURE SENDER AND RESISTOR WIRE APPLICATION CHART Engine Application Service Part No. 5.0L, 5.8L, 7.3L, Oil Pressure Sender 5652-9278 A and 7.5L on Pressure Sender EBB-9278A All Resistor Wire EGSZ-9F291-A Assembly I PART NUMBER PART NAME CLASS EGSZ-9278-A Oil Pressure Sender AG E8129278-A Oil Pressure Sender BM EGSZ-9F291-A Resistor Wire Assembly AG OTHER APPLICABLE ARTICLES: None WARRANTY STATUS: Eligible Under Basic Warranty Coverage OPERATION: 880514A TIME: 0.4 Hr. DLR. CODING: Basic Part No. 9278 Code: 09 PAGE 37