speedo is fast

[DannyStang08]

just wanted to know if anyone knows how to calibate a speedometer i have a 2008 mustang gt 300. Do i need a tuner to do this or does anyone have a tuner to do this. Speedo is 10 miles an hour fast then what i am really going. Please let me know if you can help. Thanks Danny

[G9-07-Eddie]

have you changeg anything in it like gears or tire sizes? to do that you need a tuner cause tuners are married to the car you can't borrow someones tuner to do that, thats now how it works hope this helps you

[DannyStang08]

thanks so i have to buy a tuner hahaha i think it have different gearing

[G9-07-Eddie]

yes you have to buy one did you get the car used? did the last owner have a tuner or he just changed the gears and if so you need to know what gears got put in so you can do that with the tuner

[Hotshot]

2 things, gears or size of tires will throw off your speedo. you can get a speedo recal tool but its best to get a tuner, while you're at it, a CAI and tuner actually

[infamousjim]

If you don't have a tuner yet... get one no matter what. Once you do tune the car you will be AMAZED there was that much more pep in the car.