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Compatibility: Oil pressure switch for engines compatible with Mitsubishi L3E and L2E, and equipment compatible with Case Mini 50 and CX50; verify connector type and port with the part. OEM numbers: Replacement references include 31A9000601, 31A90-00601, and MM431777; match these codes to the removed switch to confirm interchange for a simple one-piece replacement. Function and build: Monitors engine oil pressure and signals a warning or shutdown when pressure drops; metal housing and insulated terminal support sealed performance in compact engine bays on small equipment. Installation and use: Restores oil pressure indication after leaks, overhaul, or sensor failure; fits common indicator circuits on generators, pumps, small loaders, and mini excavators using this style switch. Applications: Suited for farm, construction, and industrial sites; ideal for compact machines and stationary units compatible with Mitsubishi L3E and L2E or equipment compatible with Case 50 and CX50.