I am in need of a tcm tune file to use for a segment swap...I think..unless I am making this more difficult than it needs to be. I have the 2007 gen iv E38 ecm and T42 tcm. Attached screenshot of OS versions. I've read tons of posts and forums etc on here as well as LS1Tech site and am getting conflicting and or outdated information. I don't know what my options are to get the 4l80e setup and working correctly........