I can't really understand from the files, nor can I find anything on the wiki. I don't mind overwriting game files, as I can just repair the game with steam or delete the mod if possible. Here's the file I made. It also be quite helpful to have a breakdown of how it works. Also just to show it's possible
the etk gps file is located in the "common.zip", not the etk 800 zip also, the video is too big, it should be 256x128