Bully Dog Big Rig Heavy Duty Gauge Tuner

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Parleys Diesel presents the Heavy Duty Gauge Tuner (HDGT) from Bully Dog Big Rig. The HDGT is Bully Dog’s top heavy duty product and represents years of development and ingenuity. Incorporating Bully Dog’s time-tested, SAE approved economy tuning with the complete gauge package, diagnostics capabilities and proven Driving Coach software of the already revolutionary Heavy Duty WatchDog — the HDGT is every big rig owner’s dream.

The Heavy Duty GT’s tuning options surpass those offered by competing tuners in customization and selection. Choose between the standard Economy Tune, or go with the Economy+Power Tune. With the Heavy Duty Gauge Tuner you can monitor live efficiency readings and safety warnings at the same time. Read and clear trouble codes and perform diagnostics on the road without a mechanic, adjust the top speed limiter, and so much more. Incredibly, the physical installation takes less than 5 minutes.

Key Features

  • 3 Power Levels
  • 15-20% Power Increase
  • 6-12% More Fuel Economy
  • Easy Install
  • Read & Clear Trouble Codes
  • Speed Limiter & Cruise Limiter Adjustment
  • Coolant Temperature Warning
  • Oil Temperature Warning
  • Boost Warning Alarm
  • Switches Easily Back to Stock
  • Includes Internet Updates, Upgrades and Customized Tunes
  • Note: Does Not Support Emissions Deletes

Bully Dog has invested significant resources in research, engineering and testing into the Heavy Duty GT. Designed with the one goal of adding bottom-line profits through lower fuel consumption costs, the HDGT delivers. Return on Investment (ROI) with an HDGT is often realized in a matter of months, not years — saving drivers and fleets real money every haul! Updates and upgrades are available for free over the Internet for as long as you own your Bully Dog Big Rig tuner. Bully Dog is serious about Big Rigs, and it shows in their dedication and the work they’ve put into the Heavy Duty Gauge Tuner.


Fits The Following CAT Engines

  • 2004-2010 9.3L C-9
  • 1999-2003 10.3L C-10
  • 2004-2010 11.1L C-11
  • 1997-2003 12.0L C-12
  • 2004-2010 12.5L C-13
  • 1995-1998 14.6L & 15.8L 3406E
  • 1999-2004 14.6L C-15
  • 2005-2010 15.2L C-15 ACERT
  • 1999-2003 15.8L C-16
  • 1999-2003 18.1L C-18

Fits The Following Cummins Engines

  • 2007-2020 6.7L ISB
  • 2007-2016 8.3L ISC
  • 2007-2016 8.9L ISL
  • 1999-2003 10.8L ISM CM570
  • 2004-2010 10.8L ISM
  • 2010-2011 11.9L ISX 11.9
  • 2011-2016 11.9L ISX 12
  • 1998-2000 14.9L N14
  • 2000-2003 14.9L ISX CM570 Signature
  • 2004-2007 14.9L ISX CM870
  • 2008-2010 14.9L ISX CM871
  • 2011-2012 14.9L ISX 15 CM2250
  • 2013-2021 14.9L ISX 15 CM2350
  • 2017-2021 14.9L X15 485, 505, 525, 565 & 605 HP Power Series Engines
  • Note: Does Not Support X15 Efficiency Series Engines (Horsepower Ending in a 0)

Fits The Following Detroit Engines

  • 1999-2003 12.7L Series 60 DDEC 4
  • 2004-2007 12.7L Series 60 DDEC 5
  • 2007-2016 12.8L DD13
  • 2001-2003 14.0L Series 60 DDEC 4
  • 2004-2007 14.0L Series 60 DDEC 5
  • 2008-2010 14.0L Series 60 DDEC 6
  • 2007-2016 14.8L DD15
  • 2010-2016 15.6L DD16

Fits The Following Mercedes Engines

  • 2007.5-2010 7.2L MBE 900
  • 2007.5-2010 12.8L MBE 4000 
  • Note: 2007.5 Models have a DPF



Bully Dog Big Rig Tuner Testimonial Video Playlist. (Videos automatically play one after another)


Engineered to safely improve the operation of heavy duty trucks by providing a more efficient fuel burn, the HDGT features enhanced real-time feedback thereby heightening driver awareness. This saves time and fuel — which translates into money for fleet owners and owner-operators. The available features and high-end tuning offered by the HDGT are expertly assembled offering maximum value to drivers and companies. This value is truly compounded by unique Bully Dog custom tunes for every truck included in every HDGT.

Bully Dog Big Rig Tuner Mileage Test





Installation Instructions

Customer Reviews

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