TM 10-3930-669-20 7-42.  ENGINE OIL PRESSURE SENSOR REPLACEMENT. This task covers: a.    Removal b.    Installation INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive (Item 1, Appendix B) Materials/ Parts Cap and Plug Set (Item 5, Appendix C) Rags, Wiping (Item 19, Appendix C) Washer, Lock Equipment Condition Engine OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) Cab door opened (TM 10-3930-669-10) Engine access cover opened (TM 10-3930-669-10) Batteries disconnected (Para 7-48) a. Removal. WARNING BURN HAZARD Allow  engine  to  cool  before  performing  maintenance  on  the  muffler,  exhaust  pipe,  exhaust manifold, or turbocharger.  If necessary, use insulated pads and gloves. (1) Remove nut (1), lock washer (2), washer (3), and wire (4) from engine oil pressure sensor (5).  Discard lock washer. (2) Using a wiping rag, clean area around engine oil pressure sensor (5) and heater valve (6). NOTE Cap and plug engine oil pressure sensor and heater valve when removed. (3) Remove engine oil pressure sensor (5) from heater valve (6). 7-94