I have the inline not the OBD version I had some issues also they even sent me another harnessI did not, I'll give that a try. That totally slipped my mind. Currently the inline calibrator is installed with the correct tire adjustments, should I try to revert the X4 to stock and see if that does anything different or take the calibrator back to stock before the X4?
I wound up having to use like a 44" tire to get my 37" to read spot on
it's been a long time since I did it but I will say have the cord plugged in and just coiled up behind the triangle dash cover at the A pillar so you can just pug in and not have to pop the dash
i also do not think you need to untune the truck the Hypertech inline takes the signal headed to the cluster and adjust it