Lisle 13250 Oil Pressure Switch Socket Fits 1 1/16" switches up to 2 5/8" long, found on newer GM and Chrysler vehicles Fits 1 1/16" oil pressure sending unit (gauge type), found on most all 1991 and newer GM vehicles Also fits 1987 and newer Chrysler vehicles with combination light and gauge oil pressure switches Use with 3/8" drive or 1 1/8" hex.