This 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 47  Off 28. 

Make 150% sure this is working properly or your compressor will lock up and you'll be wanting to claim a miss-guided warranty if available etc... This is another critical part.

The worst repair is one that has to be done twice because the product failed to do the job the first time.

Fits but not limited too: