Bully Dog introduces the Heavy Duty WatchDog. Included in the WatchDog is a Driving Coach Fuel Economy Optimizer to provide both visual and audio feedback to the driver and an instantaneous score ranging from A to F depending on how well they are driving safely and efficiently. The WatchDog also has the ability to display and erase engine trouble codes, adjust the speed limiter and includes a free GearMaster trial. The Heavy Duty WD includes a digital gauge package and the gauges displayed will be dependent on the tractor engine. The Heavy Duty WD works on Cat, Cummins and Detroit engines, but other engines including Volvo, Mercedes, Mack, Paccar and Navistar are in development.