Gauge Inaccurate

Disconnect fuel pump/oil pressure switch/sender connector. Connect one Red lead of Gauge Tester (J-33431-B) to fuel pump/oil pressure switch/sender connector terminal "A" (Tan wire). See WIRING DIAGRAMS . Connect other Red lead to ground. Turn ignition on. Set resistance dial to zero ohms, and then to 90 ohms. If oil pressure gauge indicates low pressure, and then high pressure, replace fuel pump/oil pressure switch/sender. If oil pressure gauge does not indicate low pressure, and then high pressure, repair open in Tan wire between fuel pump/oil pressure switch/sender and instrument cluster. If Tan wire is okay, replace instrument cluster.