You need to remove the screws and wiring.The oil sending unit just screws out. Remove the wiring to it first, and then using a ratchet, unscrew it. Please take care, you disconnect the wiring very delicately.
Because of the odd head on it, a special socket is needed. When you purchase the switch, look at it to confirm you have a tool that will work. If you don't, the parts store will most likely have the socket you need.\The sending unit on the engine block.
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