Lisle 13200 Universal Oil Pressure Sending Unit Socket For late-80s through mid-90s GM vehicles with oil pressure sending units (for vehicles equipped with gauges). One socket with the correct length to fit most 1" and 1 1/16" oil pressure switches (for vehicles equipped with warning lights). 1-7/8" Overall height for clearance Use with 3/8" drive or 1 1/8" hex