You should always use an inline safety switch in your air conditioning system, ALWAYS. The pressure switch is a protection switch that's designed to stop your compressor clutch from operating in the event of a rapid increase or decrease in pressure. Doing so saves your compressor from damage. Any pressure level below 30 psi can make the air compressor shut off. This can, in turn, make the A/C system freeze up and cause further damage. Vintage Air has a variety of binary and trinary switches as well as fittings and adapters to retro-fit to virtually any A/C system. Switches are sold individually. Switches are shown on switch port fittings and driers which are both sold separately.
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.