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Hello, unless you have the 8.1L motor, the post below should be what you need. Note, it does require a special socket to fit the sensor. Most parts stores will have one. Thanks
J 41712 Oil Pressure Switch Socket
Tighten Tighten the oil pressure sensor to 35 N·m (26 lb ft).
Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)