Advanced 3 Gearbox Controller
It's a controller for switching between 3 gearboxes.
Controller handles engine clutch when switching, (when not switching it just passes through the clutch power you want to give the engine), and the switching happens via an up and down logic input.
The controller assumes that gear 1 is reverse.
If using passhtrough for reversing, don't forget to use push button input. It's more convenient.
