New gears = Messed up Speedometer

[BlueZ06]

@obi-1

I picked up a hypertech programmer for about 150 on eBay for my truck.
(Maybe 170?) You can only use it on 1 vehicle at a time.

You just type in what gears you have and tire size and it calibrates the speedometer for you.

yup, exactly what I was explaining. Unless you have the actual software thats usually used from a laptop or desktop computer and a tuner license, the handhelds are worthless unless you actually purchase one for just yourself