Gear selection control lever
The lever has only one stable position (A) and 4 unstable (+, -, N, R).
It has four normally open switches, each with two electric resistors (one in parallel at contact, the other in series). To go to a higher gear, push the lever toward (+), to have a lower gear, push toward (-). To insert idle (N) move the control lever to the right Reverse gear (R) can be engaged from any gear, moving the gear lever to the right then back, with the vehicle stationary and the brake pedal pressed.