i have 4.10 gears in my 2003 gt. i also have a new odometer that fits over the old one but the only diff is that it is blue and white. i have my diablo set up for the 4.09 because it does not give the option for 4.10s. but i was going down i75 and i did a top speed run and i was going 145mph and the needle jumped up to 130mph and then went back to i guess the right speed at 150 and then berried to the little black stopper and right when it hit the needle immediately jumped backwards to 0mph. wtf happen my mph dont work and my miles arnt going up but how do i fix it???