CAT Power Harness
CAT Power Harness CAT Fuel Efficiency Harness CAT Power Harness

Frequently Asked Questions


QUESTION: How do they work?

ANSWER: There is a fuel temp harness that you plug in between your fuel temp sensor and your wiring. That will advance the timing on your engine. The scond harness plugs into your boost pressure sensor and alters the fuel rate to the motor. You can have that fixed or adjustable.


QUESTION: Will these harnesses effect the longevity or reliability of my engine?

ANSWER: No. We have never experienced an ill effect by running these harnesses on any motor. The factory has maximum parameters already programmed into your ECM on your engine. All we do is go to those max parameters. We cannot make it go past those. Your engine is still within the maximum allowable specs of your engine set by your factory.



QUESTION: Will this effect my engine warranty?

ANSWER: No. We are an ADD-ON after market product. To date after 15 years of service, we have not had a single warranty issue. If you do not want/like the product, just remove it and it leaves no trace or footprint on the engine or in the ECM.



QUESTION: How hard is it to install?

ANSWER: With every harness order you get detailed instructions sent along with a wiring diagram of your engine. The fixed harness typically takes 5 minutes. The adjustable harness could take up to an hour.



QUESTION: What are the exact gains?

ANSWER: CAT Engines vary alot within and out of models. Typically the single turbo cab gain about 75 horse power 150 ft lbs of torque. Twin Turbo Acers gain about 80 HP and 200 ft lbs of torque. For fuel, single turbo's gain about .75 to 1 mpg. The Twin Turbo's gain about 1 to 1.25 MPG.



QUESTION: What Models are supported?

ANSWER: Our CAT Power harness fit a wide range of engines. Typically from 1994 to 2008. They will fit your 3406E C12, C13, C15, C16 Engine. If you have any questions about your engine or if it isn't one of those, call us. We'll tell you if your engine will be compatable.



QUESTION: Will my engine run differently?

ANSWER: Yes it will. There will be no more turbo lag, virtually eliminated and your throttle response will be quick and crisp.






CAT Fuel Savers, CAT power harness

Regular Price: $165.00
Engine #


Do you own a electronic caterpillar engine?

Save fuel and run better too. What you are buying are the best power harnesses on the market. They have been built and tested by a CAT master mechanic. They were developed and tested for two years before being sold to the public. Many have imitated but never duplicated the Diesel Freak brand of caterpillar power harnesses. Dyno results from 10 different trucks show increases in horsepower around 70 hp and torque around 200 ft lbs. Increases in fuel mileage have been from .5 mpg to as high as 2 mpg depending on application. These harnesses were built for one thing, that was to increase fuel mileage. They can save you thousands of dollars in fuel costs. The harnesses are professionally built and tested before shipping. They carry a lifetime warranty and are made in the USA. If for any reason you do not like the results I offer a 100% money back guaranty. Simply return the product within 60 days for a full refund.

These harnesses will not work on the 3126 or the bridge, engine serial number prefix MBN, or MBL.

There are two types availible, Big power gain or fuel saver. You gain power with either one just let me know which you prefer.

When placing a order I must have your engine serial to make sure you get exactly what your engine needs.

Also anybody into truck pulling can have a custom set built with fuel pump trick kit depending on gain needed. email me for more info.

Make sure to email me your engine serial number.