I had a little rummage behind the right hand corner of the dashboard and lo and behold, there is was. I would never have found it without some help. It works fine and will turn the dash lights right off if required. The next job is to drill a little hole in the side of the ali. dash panel just under the cowl and fix it so I can use it whilst driving.
Thanks again Dave, it just shows there is no such thing as a silly question, and hopefully other ARP4 owners who haven't found it yet will benefit too.
