Standard Motor Parts Oil Pressure Switch. Part PS270. See pic.

Engine Oil Pressure Switch Standard PS-270

standard genuine parts switch part # ps-270

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For Chevy Silverado GMC Sierra 1500 2500 3500 Oil Pressure Sending Unit Sensor

Oil Pressure Sensor Switch Sensor Fits for Chevrolet Silverado 1500

12677836 Engine Oil Pressure Sensor For GMC Sierra Chevy Silverado 2003-2008

For Chevy Silverado GMC Sierra 1500 2500 3500 Oil Pressure Sending Unit Sensor