Congrats on the device and the time spent and the thinking and everything !! This is nice, I am always following people who create something new !
Sounds like a plan for the masses ! I think that target is spot on. Racers themselves most of the time they want one function and not even a menu. They want to see one thing and don't want to get lost in the functions/menus etc. But as you say, for the masses this will be brilliant.
Hook up that to a couple of ANT+ sensors, plus its a phone so you have a phone functionality anyway (during rest times you can still play tetris
).. The amazing thing is that even a middle market phone is far more advanced than any rally computer available today...