I think MSTuner using different way to load UI elements, its not compatible for the most of the mods that are using Unity UI.
That's wierd, it should install tacho automatically on game load, no matter if was installed before or not and it should be bolted if was bolted in a save game. Tacho on the steering colum its not supposed to light up cus i didnt implement that one. I tried many different save games and combination in order to see what will break the mod but didnt find anything like that. Anyway, i'll try to check it out, maybe for the next update will add that tacho on the steereng colum as well.