I have a Titan XXL 50gal fuel tank for my 14 Cummins that I'm going to be installing and I've been told there's no "calibration" for the DTE. Say on a Ford you can just go in and change the tank capacity, that doesn't appear to be an option. I have found several articles on 5th gen chassis that talk about changing the fuel gauge ration or something. I'm a little new to this but I do have Alfa OBD and I have played with it very little out of fear of messing things up. Reaching out to see if anyone has experience with this before I do it myself.

 

Back up your tune before you change anything. (I *think* that happens anyway??) Make your change, see what happens.