help with speedometer

[roach]

i put some 4:10 gears in my 04 gt and am trying to sell it now but i cant for the life of me find someone to re-calibrate it back to normal ive been driving it like this for about 2 years now and have 1 ticket and a bunch of extra miles that shouldnt be there, its alsoo not a very good selling point. if n e 1 knows another way please share. thanks

[SpectorV]

you cant fix the mileage but with a tuner you can make it read correctly

[jimmy_beaner]

you could get a speedcal as well, for a little cheaper than a tuner. You should always adjust the speedo when you change the gears. They go hand in hand.