--The ATACC uses our patented temperature compensation used in the TEMPA FLOW coupled with a patent pending baromaetric pressure adjustment, providing complete automatic fuel flow adjustment. For snowmobile applications the ATACC leans the fuel mixture at temperatures above -20F (-29C), but can easily be set for other minimum temperatures. The unique air pressure sensing section also allows the ATACC to easily be set for any minimum altitude. This product provides compensation for normal temperature changes as well as elevation changes of over 10000 feet (3000 meters).