Air Lift's most popular compressor and air control system for trucks, vans, and SUVs. The basic system controls rear bags together for front-to rear leveling. Kit includes exclusive wiring harness for fast, easy installation. To eliminate the major cause of air spring failure, the Low Pressure Sensor automatically activates if pressure falls below the minimum safe level. Ready Air Supply. 5 psi Low Pressure Sensor. Economically Priced Pre-assembled wiring harness, electronic sensor system, & compressor. Levels Vehicle Side To Side Comes With New Wiring Harness | Air Lift Load Controller II - Single Path