The switch is already there.. Its on your handle bars, clutch side. right above the start button.. Mine is wired the same way.. NO key but you can still turn it off by the switch on your handle bars. its a slide switch. to the left and right is OFF and in the middle is ON. That switch on mine was actually busted up also, So i usesd a ROCKER switch there instead. Looks good..
i want to get a aftermarket light and put ALL my switches on the bracket for the light.. Nothing on the handle bars except the start button...
Good Luck !!!
Jason