I have it set up in my car. Although if your driving a nissan your in luck as they have a neutral switch in the gearbox already, so you just tap into that wire and your set.
I cant remember the colour on the u12 ecu for neutral, jono will correct me no doubt. Using the stock neutral switch its worked without fault for years on end. Wont start in gear, and turbo timer wont run in gear either (turbo timer is built into my alarm).