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Use on Low Side of system.
Shuts off before going into vacuum,
Wire Switch in Series with Coil Wire for Low Side Protection

Can Use 530-4030 OE Switch Kit

With Two 1/4" Male Switch Ports for Hi and Lo Side
Includes 2 Manifold O-Rings

Use with 990-403, 990-405 Conversion Kits for Lo and Hi Side Protection
Includes 451-11602 Manifold and 530-4030 Switch Kit

Includes 451-11605 Manifold, 530-4030 Switch Kit, and Two R134a Adapters
Use with A6/Delco and Sanden/Seltec Compressor with GM Pad Mount

3 1/4" Front to Rear Inside Ear Measurement

Can use Alternative Compressor - 509-5773

OE Style
Gives true High and Low Side Protection
Used in 990-403, 990-404, 990-405, and 990-406 JD Conversion Kits

High Pressure Switch = Normally Closed
Low Pressure Switch = Normally Open