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Bully Dog Big Rig Heavy Duty GT Gauge Tuner

Product Code: Z2BBR814.02
Bully Dog Big Rig HD Gauge Tuner

Bully Dog Big Rig HD Gauge Tuner

Bully Dog Big Rig HD Gauge Tuner Bully Dog Big Rig HD Gauge Tuner Big Rig HD Gauge Tuner w/RAM Mount


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Price:    $2799.99
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Bully Dog Big Rig Heavy Duty GT Tuner for Caterpillar, Cummins & Detroit Diesel Semi Trucks

The Bully Dog Heavy Duty Gauge Tuner (HDGT) is the absolute best performance product for independent owner/operators and for fleet owners & service managers. The HDGT combines Bully Dog's proven Engine & ECM Tuning with all the features of their WatchDog monitor. Whether your diesel tractor is equipped with a Caterpillar, Cummins or Detroit diesel engine, you get additional Power & Fuel Economy plus you'll save money on repairs!

What Is The Bully Dog HD Gauge Tuner?

The Bully Dog Heavy Duty GT Tuner is a vehicle engine tuner, monitor, gauge & diagnostic device all in a single unit. Bully Dog engineers have combined the Bully Dog Big Rig Power Pup Engine/ECM Tuner and the Big Rig Watchdog HD Digital Gauge Pack into a single device, the HDGT.

The HDGT mounts on your dash or windshield and allows you to tune your engine/ECM, while viewing key engine functions such as Throttle %, Oil Temp, Coolant Temp, Engine Load, and much more. The Bully Dog Big Rig HD GT Tuner will work on most Caterpillar, Cummins & Detroit engines with a 6-pin or 9-pin data port (see our application table below). The Big Rig HDGT comes with a no questions asked, 30-Day Money Back Guarantee!

Due to tremendous improvements in fuel economy, Bully Dog's HD GT Tuner pays for itself in a matter of a few months and continues to SAVE drivers and fleets THOUSANDS OF DOLLARS even within the first year of using the product.

The Big Rig GT Tuner downloader was designed with two goals in mind - to add bottom line profits through lower fuel consumption and add horsepower & torque in big rig trucks utilizing the Caterpillar, Cummins or Detroit diesel engine. Whether you are an owner/operator, have a fleet of thousands of trucks or somewhere in between, these downloaders have been designed for you.

Diesel Tuning Options:

  • ECONOMY TUNING - The "Economy" tune helps drivers consistently achieve mileage gains of 6% - 12%. These gains have been confirmed by independent SAE testing. See our ROI Calculator for more information on your personal fuel mileage gain potential.

  • ECONOMY + POWER TUNING - This tune improves both fuel economy and power. You will see the same 6% - 12% gains in fuel mileage, while safely increasing the horsepower and torque of your CAT, Cummins or Detroit semi truck. Dyno tests show performance increases up to 18%. You will also save time and money by being able to pull heavier loads without downshifting. Drivers have reported being able to maintain speed and gaining up to 1 ½ to 2 gears in the hills.

  • EXTRA POWER TUNING - Bully Dog engineers wanted to give you even power! So they developed an additional power tune, which has produced an average of 20% more horsepower the economy + power tune.

  • CUSTOM TUNING - For drivers who want more power than the standard power tune or want to dial in fuel economy and performance. Bully Dog's professionally trained tuners can work with you to provide extra power or tweak your tune for certain styles of hauling, which can result in even better fuel economy. Custom tuning is provided for no additional cost.

Includes All Features of the WatchDog HD

The Bully Dog Big Rig HD GT Tuner is also a digital gauge pack that allows the big rig driver to view key engine functions such as Throttle %, Oil Temp, Coolant Temp, Engine Load, and much more. You will also be able to set automated safety warnings to prevent unsafe engine temps & levels from damaging your rig. The HDGT also has Driving Coach software that can help you save huge amounts of money by instantly displaying fuel economy, trip economy and more. The Big Rig HDGT also allows you to Read & Erase Diagnostic Trouble Codes and Adjust the Speed Limiter on your big rig truck, so that you can remain within the law and avoid fines and other fees. All viewable functions can be set to U.S. Units or Metric Units for Canadian trucking.

The Big Rig Heavy Duty Gauge Tuner Acts as a Set of Digital Gauges

With the Bully Dog HDGT, you'll be able to view (4) four vehicle parameters at one time. You will also be able to pre-determine and set up your own safety parameters for unsafe vehicle temps and/or fluid levels. If your Caterpillar, Cummins or Detroit diesel tractor comes within those parameters, a visual and audible warning will be given by the GT Tuner. This makes the HDGT an extremely valuable safety tool.

Parameters Viewable & Recordable with the Bully Dog HD GT Tuner

  • Pyro 1 (exhaust gas temp in F° or C°)
  • Pyro 2 (exhaust gas temp in F° or C°)
  • Speed (MPH or KPH)
  • Boost (PSI or KPA)
  • RPM
  • Coolant (temp in F° or C°)
  • Throttle Position (0% to 100%)
  • Intake (temperature in F° or C°)
  • Oil Temp (temperature in F° or C°)
  • Oil Pressure (PSI or KPA)
  • Trans Temp (temperature in F° or C°)
  • Battery (instant output in volts)
  • Fuel Pressure (PSI or KPA)
  • Load (0% to 100%)
  • Timing (in degrees)
  • MAF (mass air flow in grams/sec)
  • Instant Fuel Economy (Miles/gal. or Liters/100 kilometers)
  • Average Fuel Economy (Miles/gal. or Liters/100 kilometers)
  • Trip Distance (Miles or Kilometers)
  • Trip Fuel (Gallons/ hour or Liters/ hour)
  • Fuel Flow (gallons/hour or Liters/hour)
  • Fuel Level %

A very important thing to understand is that not all of these parameters are broadcast by every vehicle, so the GT Tuner will not be able to pick up all of the parameters on every vehicle. Another important thing to note is that newer vehicles will, in general, broadcast more of this information than earlier model vehicles. The Bully Dog Sensor Docking Station can be purchased separately and will allow you to add up to 6 additional sensors that you will be able to view the parameter’s for on the display screen.

Driving Coach Software Included

The Driving Coach is software unique to Bully Dog gauge packs that can save the big rig truck owner or fleet operator an amazing amount of fuel and comes standard on the Big Rig GT Tuner. The Driving Coach is a fuel economy optimizer that allows the big rig driver to view key fuel economy factors, such as Instant Fuel Economy, Trip Fuel Economy, Driving Efficiency, Trip Fuel and more.

Key Driving Coach Software Features:

  • Display instant fuel economy
  • Display trip economy info
  • Display driving efficiency
  • Visual and audible feedback
  • Export driving reports into Excel
  • Password Protection available
  • Record and analyze key parameters

The Driving Coach also allows you to record and then export all this data into an Excel spreadsheet for further analysis and can be password protected. This makes the Bully Dog GT Tuner an even more valuable tool for the fleet manager, as the results of an extremely efficient driver can then be imported into the HDGT of another, less efficient, driver to guide and teach that driver how to be more fuel efficient and safe.

The Bully Dog HD GT Tuner Reads & Clears Diagnostic Trouble Codes

Now with the Big Rig Heavy Duty GT Tuner, you can perform vehicle diagnostics without having to pay a truck repair shop big bucks. The diesel tractor driver, owner, fleet manager or fleet mechanic can read trouble code numbers and descriptions and then be able to erase the code(s) from the engine or drivetrain computer. You'll save lots of money with this great feature.

Adjust the Speed Limiter

The Bully Dog HDGT allows the user to adjust the Speed Limiter. The owner will be able to set the big rig truck's overall top speed, as well as setting a Cruise Low (the lowest speed limit at which cruise control can be used and set) and a Cruise High (highest speed limit at which cruise control can be used and set). Save money on fines & fees and also have the peace of mind of knowing that you're not going to be over the speed limit. Fleet Managers can improve the fuel economy of their entire fleet by lowering speed limiters across the fleet.

Limiting the top speed of your over-the-road truck can dramatically reduce fuel consumption; even dropping down by 1-2mph will have a positive effect and can save you money! The Speed Limiter is set in the Special Features menu of the HDGT, which also features the ability to set an Idle Timer....The Idle Timer will determine the maximum amount of time that the tractor truck is allowed to run at idle before the engine is automatically shut off. Reducing the idle time of your big rig is another way to save money on fuel. Just another great feature of the Bully Dog Big Rig HD GT Tuner!

GearMaster Shiftometer Software

The Bully Dog HD Tuner comes standard with a free trial version of GearMaster Shiftometer Software. The trial will last for 60 engine starts and 1,500 miles. The trial begins as soon as you start the transmission calibration procedure. You will have the option to fully purchase this software after the trial is completed and only requires a simple update of the HDGT to install the unlimited version.

The GearMaster Shiftometer Software helps to eliminate missed gears when shifting, which will greatly reduce wear & tear on the entire drivetrain. The Gear Master is a software program with an interactive transmission gear indicator. The Gear Master is essentially a shiftometer...instead of using speedometers and tachometers, the Gear Master makes it possible to efficiently gauge proper shifting by utilizing it's software to indicate to the driver when the optimal shifting should occur. The mission of the Gear Master is to enhance driver awareness to improve shifting conditions, resulting in better efficiency and safety.

Bully Dog Big Rig GT Tuner Installation

Installation of the Heavy Duty GT Tuner is fast & easy and requires no tools. Simply plug into the data port of your truck and follow the on-screen instructions. The typical installation takes 5-10 minutes and the Big Rig GT Tuner includes a Heavy Duty RAM Mount Suction Cup Kit, so you can mount the HDGT to your Caterpillar, Cummins or Detroit engine-equipped tractor's windshield or dash. SEE OUR INSTALLATION VIDEO BELOW!

The Bully Dog Big Rig HD GT Tuner Bottom Line

By purchasing the Bully Dog HDGT, owner operators, fleet managers and/or fleet owners can save a great amount of money on fuel, repairs, diagnostics and devaluation of their Caterpillar, Cummins or Detroit equipped trucks. The Bully Dog Big Rig HD Tuner offers a myriad of ways to improve fuel economy, as well as driver ability and efficiency, all in one small, inexpensive package. The savings will become apparent almost immediately.

Bully Dog Big Rig Fuel Mileage Test Video:

Calculating Fuel Mileage with the HDGT:

Bully Dog feels so strongly about the ability of the Bully Dog Big Rig HD GT Tuner to add Power, Fuel Economy and Efficiency to your diesel tractor truck that they offer a 30-day, no questions asked, Money Back Guarantee! Feel Free To Call TruckCustomizers With Any Questions You May Have @ 800-497-1780.

The Bully Dog Big Rig HD GT Tuner Installation Video:

Testimonial From Actual User:

"I heard about Bully Dog from my younger brother who purchased a 2007 Peterbilt® Cat® powered truck that was already installed with a Bully Dog. He really liked the way the truck ran and encouraged me to get one for my truck. I am an independent truck driver that has been driving since the 70’s. I haul agriculture products on local runs mainly on two lane roads here in the Midwest. Over the years most of my trucks were powered by either Cat or Cummins®. Right now I am driving a 2000 Kenworth® with a Detroit 12.7L with factory settings of 470/500. This is the first Detroit that I have ever had and initially I didn’t like it very much. It was underpowered, but after installing the HDGT I am learning to like it now more every day.

HDGT Testimonial:

I installed the Bully Dog HDGT in July 2013 so at this point I have been running it for a month and a half. In that time I have gone from 6 MPG to 6.8 MPG or a 13% gain in fuel economy. What I really like about it is the lowering of the torque range. Now I have plenty of power down around 1300 to 1400 RPM. I have had to pretty much learn to drive the truck all over because I use about a quarter of the throttle now instead of three quarters. I am real happy with the way the truck performs. Initially after I installed it I was driving the truck too hard and didn’t pick up the fuel economy like I expected. Your dealer told me to pay attention to the gauges up on the dash and keep the load and the throttle around 60%. I didn’t do that at the start and I was running it at 90% to 100%. So I had to learn to keep my foot out of it and let it do its thing. It took a while for me to figure it out, but it works great now. It has really impressed me on the way it changed the performance of this truck and all for the better. It is doing a wonderful job and I am really satisfied with it."




YearModelDescriptionInstall Info Part #Price Qty 
1994-2010Caterpillar 3406E / C7 / C9 / C10 / C11 / C12 / C13 / C15 / C16Big Rig HD GT Tuner6-pin or 9-pin
data port
YearModelDescriptionInstall Info Part #Price Qty 
2003-2006Cummins ISX / ISMBig Rig HD GT Tuner6-pin or 9-pin46500$2799.99
2007-2010Cummins ISC / ISL / ISX / ISMBig Rig HD GT Tuner6-pin or 9-pin
data port
2011-2013Cummins ISC / ISL / ISX 11.9 / ISX 15Big Rig HD GT Tuner6-pin or 9-pin46500$2799.99
YearModelDescriptionInstall Info Part #Price Qty 
1998-2007Detroit 60 Series DDEC IV / DDEC VBig Rig HD GT Tuner6-pin or 9-pin
data port
YearModelDescriptionInstall Info Part #Price Qty 
2010-2012Paccar MXBig Rig HD GT Tuner6-pin or 9-pin46500$2799.99
2008-2013Paccar PX-8Big Rig HD GT Tuner6-pin or 9-pin46500$2799.99
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