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On the 2003+ with the 6.0 you can push and hold the RESET button for the trip odometer and then turn the key on and start the truck and every time you push the reset button it does like a hundread different things. Digital tach, digital MPG, fuel added, fuel pressure, motor temp, gauge test....yadda yadda and a whole lot more yada's. I will try and find the link.....if I do I will post it.