I used this for a switch...
7/8" Motorcycle Atv Pit Bike Horn~Lights~Tu. This Switch has the following features it has a button for your Horn, it has left and right turn signals, and a ON/OFF button for your lights. NO INSTRUCTIONS 1 X Motorcycle Horn Light Turn Signals On/Off Switch.
www.ebay.com
Also need a 12v relay as you can't hook the horn directly through the switch as it draws too many amps.
Happy to help you out on the install. Not really looking to get paid for it so I'm cheap, but we also might need to work out a time after my real job in the evening or a weekend I'm not riding.
Pm me and we can figure it out.