thanks, what about the shift points can i change them? i have a 2000 f250 with the 7.3L it has 4:10 gears and 40" tires. what can i do to make it better?

just bought a 7.3 psd that came with a predator tuner. i was wondering if i could do a custom tune to fix the speedometer gearing? am i able to use the tuner even if it is not registered in my name? i have serial number and part number. please help me out. thanks