Gear Ratio

[BullittGt15]

Hi I have a 3.55 rear end gear and my tachometer is way off and i adjusted it on my tuner but its still seems to be off can someone help me out here and its on a 01 mustang GT and the tuner is a Diablosport predator U7146

thanks

[Phil]

Pick the tune you would like to install to your vehicle. When it gives you the choice of install tune / modify tune. Choose modify tune. Go into modify parameters and make your change. Then escape back to install tune with the parameters you just modified.

[BullittGt15]

Alright i see now.... awesome thanks phil!