Does it have a separate horn button? Can it be wired into the regular horn wiring that honks when you press the steering wheel horn??
It will work with the regular button on the steering wheel with no problem. But, if you needed to, you could buy an additional button to mount somewhere just incase you need a seperate system hooked up in addition to the stock horn. But, yeah, you can hook it up to your steering wheel button and work just fine. Just replace only the horn itself...
That's probably where I would connect it to, since the only time I really use the horn is sort of emergencies when something jumps out in front of me (like stupid drivers in other cars). I naturally reach for the horn on the steering wheel to sound the horn.
I once had a van that I put air horns mounted outside on the roof. I had a compressor that took air from the engine and fed it to an old 5 gallon propane size tank that I had behind the driver's seat. I had a chain that I pulled overhead. When I got on the horn (pulled the chain down) the other drivers could get a taste of my air horn noise for a long time. It certainly got their attention!!