Avantadrive

I'm considering wiring my airhorn to my car's steering wheel horn switch. The ONLY way I can do this is if I figure out what accessible wires connect to the momentary switch in the steering wheel, that i can simply disconnect and reconnect the airhorn to. Does anyone know if these wires exist or if this is possible? If so, where could I find these wires, and what color would they be (I imagine they'd be bundled up with a bunch of other wires)? Any info would be appreciated... Thanks