GM Harrison Compressor Switch - BlackGM Harrison Compressor Switch Black Normally Open, 2 Pin Replaces Single Pin, White GM Cars 01 75, GM Trucks 01 77, On 50 PSI, Off 44 PSI Specifications Product Condition: New 100% brand new and high quality. The product is the same size as the original part, and replacement is simple. One year warranty, shipped within 1 2 days and delivered within 10 20 days. We will refund or reship for free any unreceived items that exceed our estimated shipping