07F350_6.0
New member
So Ive been searching for so many different ways to get my speedometer to read correctly. Searched to no success on other sites. My 07 Lariat came with factory 275/65/20. Im not running 33x12.5x20. My speedometer is off by 4 to 5 mph. Ive tried using my SCT Livewire to adjust with the CORRECT RPM. But doesnt work, which Ive read up happens alot. Ive used the IDS to try and change it as I work at a Ford Dealership. DOesnt work. Are there any aftermarket devices designed for adjusting the speedometer? Thanks. If this has been brought up before I apologize ahead of time :toast: