My master has this set up , you can see the light switch screwed to the underside on the right of the pic . I was having trouble with mine and thought about buying a new one , seems that isnt possible . So I thought I would get a reproduction only to find out that they do not have an option for the switch . If yours doesnt have the option for a switch then you would have to put a pressure switch inline . You could use the banjo on the front fork for this