Victor - I think Eric was taking your original drawing at face value where you show one side of the Lane switch to be a ground. What Eric stated was correct for an electrical circuit based on what's on the drawing. You are right to try and figure out what Mother Rotax is doing for real since the Lane switch is nothing more than completing continuity between those two pins on HIC a and B.
Since I am going to use a 912is and the VPX I am watching this with a lot of interest.
G