I had issues with the program you have to download and install to setup the device before you can connect it to the vehicle. The driver for the program simply would not work and the company just wanted me to swap the kit out, which I did twice. I ended up getting help from a Tacoma Tuner from a Toyota forum. Once we figured it out, the device works great on my 2019 Tacoma! Running 35"" tires, my speedometer was off 7mph at 70, it's now spot on, confirmed via GPS speed. I used the GPS speed setting in the program rather than the tire size, as tire sizing can be off (35"" advertised tire once installed with weight is really like a 33.5"" tire). Correcting the speedometer also corrects the mileage for your odometer and fuel mileage information, which is great!