i was wondering i have read the predator corrects speedometer for different tire sizes (thinking of going 285's). does it correct the speedo on the truck or just a readout somewhere else? thanks a bunch..............

It corrects the speedo in the truck.

Used mine to re-set the speedo, seems to be right on, or at least within 1mph. Works good, and I run 285's also.

J-HEFF