The Bully Dog GT 40420 is a performance tuner AND monitor all in one compact electronic device! Get more horsepower, torque, and increase fuel efficiency in your truck with Bully Dogâ€™s legendary tuning. All you need to do is plug the GT Tuner into your OBDII Port and perform a simple download to the vehicles ECU. With industry leading features such as on-the-fly power level adjustments, safety defueling, and the exclusive Driving Coach, the GT Tuner is the premiere all-in-one tuner.Â The GT Tuner gives you multiple power levels so you can maximize the power and efficiency of your truck whether youâ€™re towing, daily driving, or on the track! The GT Tuner features a full color display with multiple themes and has a day and night time driving mode, so you can always quickly and clearly monitor important vehicle parameters. In addition, the GT Tuner can be used as a diagnostic tool giving you the ability to read and clear diagnostic trouble codes.Â Â Bully Dog Driving CoachÂ Driving Coach is a special feature designed to help drivers drive more efficiently. It coaches drivers into better driving habits by providing real time visual and audio feedback as to how efficient a driver is driving. The driving coach also provides the driver with a "grade," on how efficiently they drove during a trip. This makes driving efficiently, constructive, and fun! Drivers can use the Driving Coach to coach themselves into improved driving habits. Every driver can challenge themselves to be "The perfect driver." Parameters Monitored With Perfornance Gauge Function: Real Time Fuel economy, Average Fuel economy, Trip Fuel economy, Load %, Coolant temperature, Fuel rail pressure (diesel vehicles), Manifold absolute pressure, Engine RPM, Speed, Timing position, Air intake temperature, Mass Air Flow (grams/sec.), Throttle position, Fuel level, Battery voltage, Ambient air temperature, Transmission temperature. Along with the following diesel specific parameters: Pyrometer #1 & 2 (optional, probe sold separately), Boost, injection pulse Width, Barometer, Oil temperature, injection control pressure Features:Â Increases Horsepower & Torque Exclusive Driving Coach FeatureÂ All-In-One Gauge Display & Tuner Universal Mounting Suction Cup IncludedÂ Reads & Clears Diagnostic Trouble CodesÂ Â Defueling Based On Set Safety ParametersÂ Initiates DPF Burnoff (Most 2009+ GM / Dodge Models)Â Free Internet UpdatesÂ Applications Include:Â 1999-2016 F-Series 250-550 7.3L/6.0L/6.4L/6.7L Powerstroke (Excludes 2013+ Cab & Chassis & Manual Xfer Case) 1999-2005 Ford Excursion 7.3L/6.0L Powerstroke 2003-2017 Dodge Ram 2500-5500 5.9L/6.7L CumminsÂ (2013-2017 models require 42214 Unlock Cable, online update may be required for 2016 models.)* 2001-2015 GM 2500/3500HD 6.6L Duramax 2006-2010 GM Kodiak/Topkick 4500/5500 6.6L Duramax 2006-2014 GM Savannah/Express 2500/3500 6.6L Duramax Note: Optional EGT Probes sold separately. See items below.Â Not available for sale in the state of California Click here to read Emissions Notice.