Changing tire size

[Slopjock78]

so I finally got my gryphon back last night, and so far couldnt be happier with it!!!! definitely worth the small waiting.

so i went to change the tire size, and a notice came up that changing the tire size would not affect my speedometer. which, i'm assuming, means that my odometer is still off as well. I'm a little more worried about that cause i would like an accurate reading on my mileage.

is there anyway to change the odometer and speedometer that are actually on my truck, not on the gryphon??

thanks for the help
slopjock78