On my ciao deluxe, the lever on the headlight turns it on and off. Removing the lever by pulling it up and out is the kill switch - it's like a key.
My ciao has a blue and gray wire for the tail light. They are for brake and running light, respectively. I had to ground to frame to hook up my tail light, as I only had the two wires. YMMV with a different model of ciao.