Gilera Runner 50 converting to twin headlight?

I have a Gilera runner 50 with the single head light (which is not bright enough for dark roads). I have bought a twin head light unit and would like to wire it in. I were going to wire the original switch to the normal beam and add a toggle switch to the removable panel on the bars for the high beam. Does anyone know what voltage/amps a toggle switch should be able to take to run the high beam on this scooter? Are there any wiring kits available for this sort of thing? Are there any other ways of doing this?