R 3500 P/U 2WD V8-454 7.4L VIN W 4-bbl (1988)
Oil Pressure Gauge: Testing and Inspection
Fig. 2 Oil Pressure Gauge Diagnostic Flow Chart
Tester J24538-A or equivalent must be used to diagnosis oil pressure gauge malfunction.
When troubleshooting oil pressure gauge refer to Fig. 2 for diagnostic flow chart.