TM10-3930-660-20 8-36. ENGINE OIL PRESSURE SENDER - TEST/REPLACE (Cont’d) 4. 5. CONNECT ELECTRICAL LEAD (3) WITH NEW LOCKWASHER (2) AND NUT (1) . CONNECT BATTERIES , PARA. 8-44. TESTING 1. Do 2. 3. 4. REMOVE NUT (1) AND LOCKWASHER (2) TO DISCONNECT ELECTRICAL LEAD (3) AT SENDER (4) .   DISCARD LOCKWASHER. not remove sender from engine. CONNECT ONE OHMMETER LEAD TO THE SENDER TERMINAL (a) AND THE OTHER LEAD TO THE ENGINE GROUND. USE STE/ICE TO MONITOR ENGINE OIL PRESSURE. SEE STE/ICE PROCEDURES, PARA.  2-13. START THE ENGINE AND OBSERVE BOTH THE STE/ICE OIL PRESSURE READOUT AND THE OHMMETER. THE PRESSURE SENDER (4) SHOULD HAVE THE FOLLOWING RESISTANCE READINGS. The 0 psi reading should be done at a decreasing pressure. The 40 psi reading should be read on an increasing pressure. 5. 6. Oil Pressure Resistance 0 psi 227-257 ohms 40 psi 92-114  ohms REPLACE SENDER (4) IF RESISTANCE REQUIREMENTS ARE NOT MET. SEE INSTALLATION IN THIS PARAGAPH. CONNECT ELECTRICAL LEAD (3) AT SENDER (4). INSTALL NEW LOCKWASHER (2) AND NUT (l). 8-96