Select 2013-2018 (yes, even though you have a 19 classic)
Well, I must give you a big "Thank You" because I was able to make the change and after testing at 75 MPH, my speedo is dead on with my Garmin GPS and a GPS app I downloaded on my Android phone.
First I am not sure why but it seemed my truck was set at 2700 MM on the tire size. I did change it once on the road, got several dash lights and not being able to find the ABS as I stated above, I changed it back to 2700 and all the lights went away.
It was then with you help I found the two setting on my app as I set here at my desk but when I went and changed the tire size, from 2700 to 2650 I did not have to do anything else.
The truck has been started 3 or 4 times and as I stated I drove 75 on the freeway and the speedo is now dead on.
I will check for any code left in the truck and remove the by-pass harness before I go in for an oil change next week.
I must say I am proud of myself as I hesitated for a few months on doing this myself.
Thanks again.