Firestone Air-Command System - Xtra-Duty Dual Leveling System Analog Gauge. Adjust the ride for various load and road conditions with a flip of a switch or even a click on a remote. Individual air accessory components are also available including compressors air tanks and mounting solutions providing a wide variety of air control assist solutions. Features of Firestone Air-Command System - Xtra-Duty Dual Leveling System Xtra-Duty Air Command System Dual Leveling System Includes 9499 Compressor Best for 8-lug trucks trailers larger than 20 slide-in campers and heavy loads plus motorcycle tire golf cart tire or trailer tire inflation Gauge: Analog Package Contents: Firestone Air-Command System - Xtra-Duty Dual Leveling System Firestone 2168: Air-Command System - Xtra-Duty Dual Leveling System Analog Gauge