I want to design a diffuser that can change as the speed does, as in open and close. I assume I will need to add some sort of small motors that will move the components to the required position as the speed changes? Also, how will I connect it to the speedometer? Correct me if I'm wrong but I will need to have some component (like a CPU/control unit) that would be connected to both the speedometer and the diffuser that will control the function? My uncle did something like this 30 years go but sadly he has passed away do I can't ask him.