I recently discovered a Predator U7170 under the seat in my truck that I recently aquired, #BONUS!

Anyways I have a few questions -

Can I adjust the speedometer with this? I recently put 35s on and the speedo is way off, says Im doing 55 when its more like 68.

Can I adjust idle RPMS?

How do I go ...

Early 99 F250 SD Lariat extended cab 4WD 7.3L Turbo Diesel. Currently running the DiabloSport 85HP tune. To check out more pics and details on my full build check out my WheelWell page - https://wheelwell.com/profile/58023cd48 ... 11/garage/