Pressure Switch 79-94 GM ACThis is for cars later model cars originally Cycling cut off switch, features two pins out and this unit screws onto the accumulator (the top of the big round alloy barrel). This may come with a plastic surround now arond the connectors.. if you have a connector that does NOT have a plastic surround like pictured below.. an early series switch. trim the new switches black plastic surround down or get a new connector.. ( easier to trim it.) Spec.. On