Omg , this was my problem last 2 weeks and you show me a way to solve it mate:) thanx:) i have the same issue and looking for days but with no result.
i was thinking to connect with the wires that are coming from the gear selector but Dave Aschroft told me that this will not work!
I was thinking doing something with microswitches similar to these:
do you know if 0.5a is enough?