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USD 499
Part #: BT46501

Bully Dog 46501 Heavy Duty WatchDog

Caterpillar, Cummins, Detroit, Paccar (See Application Guide)
Part #: BT46501
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The Bully Dog 46501 Heavy Duty WatchDog is a multi-functional digital gauge pack that will help you develop fuel saving driving habits and provide you with monitoring capabilites to keep track of vital engine functions. Fleet owners, fleet managers and owner operators can use the WatchDog as a tool for improvement and a tool for analysis; the WatchDog will allow you to record and download trip information into an Excel spreadsheet. The WatchDog also packs some very important features that drivers, in the past, have paid big bucks for like the ability to run vehicle diagnostics and the ability to change the top speed limiter. Features like these come standard on the WatchDog along with many more.

Speed Limiter Adjustment
The Bully Dog Watch Dog speed limiter adjustment allows you to adjust your top speed limit in the engine computer. This is perfect for those needing to adjust speed limits to remain compliant in any state or province. Avoid costly change fees and fines, the Watch Dog does it all. (Excludes Paccar MX-13)

Gauges & Safety Warnings
The Heavy Duty WatchDog can monitor up to four parameters at once! This helps prevent unsafe engine temps and paramteres. If those temps do go up, you'll instantly be notified via user defined visual and audbile alerts.

Avoid the costs and downtime of bringing your truck to the shop. The Watch Dog will read and clear diagnostic trouble codes allowing you to perform vehicle diagnostics without having to be at the shop.

Parameters Monitored:
  • Speed
  • RPM
  • Boost
  • Throttle
  • Load 
  • Battery V
  • Coolant 
  • Intake Temp 
  • Oil Temp
  • Oil PSI 
  • Turbo EX Temp 
  • Fuel Rate 
  • Inst Econ
  • Avg Econ
  • Trip Dist
  • Trip Fuel
  • BD Aux 
  • BD Pryo 1 & 2
  • Truck Pyro 1 & 2
  • Multi-Function Gauge Display 
  • Read & Clear Diagnostic Trouble Codes
  • Set User Defined Warnings & Audible Alerts
1995-1998 14.6L CAT 3406E
1995-1998 15.8L CAT 3406E
2002-2010 7.2L CAT C-7
2004-2010 9.3L CAT C-9
1999-2003 10.3L CAT C-10
2004-2010 11.1L CAT C-11
1997-2003 12.0L CAT C-12
2004-2010 12.5L CAT C-13
1999-2003 14.6L CAT C-15
2005-2010 15.2L CAT C-15 ACERT
1999-2003 15.8L CAT C-16
1999-2003 18.1L CAT C-18

1998-2000 14.9L Cummins N14 
2000-2003 14.9L Cummins ISX CM570 Signature 
1999-2003 10.8L Cummins ISM CM570 
2007-2010 8.3L Cummins ISC 
2010-2016 8.3L Cummins ISC 8.3 
2007-2010 8.9L Cummins ISL 
2010-2016 8.9L Cummins ISL 9
2004-2010 10.8L Cummins ISM
2010-2011 11.9L Cummins ISX 11.9
2011-2016 11.9L Cummins ISX 12
2011-2012 14.9L Cummins ISX 15 CM2250
2013-2019 14.9L Cummins ISX 15 CM2350
2004-2007 14.9L Cummins ISX CM870
2008-2010 14.9L Cummins ISX CM871
2017-2019 14.9L Cummins X15 Power
2007-2016 6.7L Cummins ISB

2007-2016 12.8L Detroit DD13
2007-2016 14.8L Detroit DD15
2010-2016 15.6L Detroit DD16
1999-2003 12.7L Detroit Series 60 DDEC 4
2004-2007 12.7L Detroit Series 60 DDEC 5
2001-2003 14.0L Detroit Series 60 DDEC 4
2004-2007 14.0L Detroit Series 60 DDEC 5
2008-2010 14.0L Detroit Series 60 DDEC 6
2007-2010 7.2L Mercedes MBE 900
2007-2010 12.8L Mercedes MBE 4000

2010-2012 12.9L Paccar MX
2013-2016 12.9L Paccar MX-13
2007-2016 6.7L Paccar PX-7
2008-2012 8.3L Paccar PX-8
2013-2015 8.9L Paccar PX-9


  • MFG. Number 46501
  • Manufacturer Name Bully Dog Heavy Duty
  • Shipping Weight 5.00 lb.
  • Shipping Length 9 in.
  • Shipping Width 6 in.
  • Shipping Height 11 in.
  • Fuel Type Diesel
  • UPC 681018465014
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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Emissions Notice

This product is not legal for sale or street use in California. Certain aftermarket products are subject to governmental emission standards regulated by the California Air Resources Board. In order for these products to be legal on a specific vehicle in California, the part number must receive a CARB Executive Order (EO) number. This number makes the part legal for use only on specific years, makes and models of vehicles. A decal with CARB EO number for these parts must be displayed in the engine bay to satisfy smog inspection requirements.