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Oil Pressure Switch
Use an ohmmeter to check the continuity between the terminal and the body. If there is no continuity, replace the oil pressure switch.
Check the continuity between the terminal and the body when the fine wire is pushed. If there is continuity even when the fine wire is pushed, replace it.
If there is no continuity when a 50 kpa (7 psi) vacuum is applied through the oil hole, the switch is operating properly. Check to see that air doesn't leak. If air leaks, the diaphragm is broken. Replace the switch.