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Master Diesel Compression Test Kit

Test cylinder pressure on diesel trucks, cars, and tractors

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Product Overview

The MADDOX® Master Diesel Compression Test Kit includes specialized adapters for testing a wide range of diesel truck, car and tractor engines. This complete kit includes everything necessary for checking engine compression and diagnosing problems with valves, rings, carbon buildup and late timing. Includes a full range of accessories for testing most Domestic, European, Asian vehicles.

  • High quality dual scale gauge with relief valve measures 0-1000 PSI/0-70 kg/cm2 with +/- 2% accuracy
  • 16-1/2 in. steel wire reinforced hydraulic hose
  • Swivel-end quick coupler for easy connection to adapters
  • 7 in extension adapter for easy access in crowded engine bays

Important Information

  • Maddox is a trademark of Harbor Freight Tools. All other brands and trade names are the property of their respective owners.


Dual scale gauge, 16-1/2 in. hose, 7 in. extension, Glow plug adapters: M8 x 1.0, (2) M10 x 1.0, (3) M10 x 1.25, (2) M18 x 1.5, Glow plug hose adapters: M10 x 1.0, M14 x 1.25, Injector and other adapters: 1/2-20 UNF, 5.9L 24 valve adapter, M20 x 1.5, M22
+/- 2%
Cummings, Dodge, Ford, GM, GMC, Hino, Hummer, International, Isuzu, Land Rover, Navistar, Nissan, Sprinter, Audi, BMW, Jeep, Lincoln, Mazda, Mercedes-Benz, Mitsubishi, Peugeot, Toyota, and Volvo
Hose Length
16-1/2 in.
Shipping Weight
7.75 lb.
Working pressure (psi)
0-1000 PSI/0-70 kg/cm2
CA Residents
Warning - Prop 65 Info
Note: Specifications are approximate and subject to change


We guarantee this product to be free from defects in materials and workmanship 90 days from the date of purchase. Limitations apply.