Yup, this ^^^^ is what a lot of people are using today and it seems to get the job done and for cheap.I use the Jscan app. Pretty cheap and easy.
OBD JScan - Program With Your Smart Phone
OBD JScan is a smart phone app that when coupled with a wireless adapter give you the ability to read trouble code and other things, like many other available apps. What makes this app different is the fact that it allows you to make changes to the ECU and save them! I stumbled across this app...www.wayalife.com
You could try the ECRI.which App works best with android and BAfx module ? Jscan didnt pop up on the play store menu
ECRI worked well, simple and easy to use.Yo
You could try the ECRI.
VIDEO : Speedometer Calibration Made Easy Using GPS
After installing a new set of larger tires and or gears with a higher ratio, it is important to calibrate the speedometer on your Jeep JL Wrangler or JT Gladiator. Failure to do so will not only show you going the wrong speed, on an automatic, it will also affect your shift points. That said...www.wayalife.com