TM 10-3930-669-20 3.  LOW ENGINE OIL PRESSURE (OIL PRESSURE GAUGE CONTINUOUSLY READS LESS THAN 30 TO 60 PSI [241-276 KPA]) (CONT). KNOWN INFO TEST OPTIONS Oil level OK. Engine OK. Gauge operation test. POSSIBLE PROBLEMS REASON FOR QUESTION Oil pressure gauge faulty. Gauge wire 5 faulty. Gauge ground wire faulty. Wire 16 faulty. Oil pressure sensor faulty. If engine oil pressure gauge does not  read  at  full  scale,  gauge  is faulty.      If   gauge   reads   at   full scale, sending unit is faulty. ¬ 2-60