How to install a car horn on a 96 mitsubishi eclipse spyder?

i need to install a car horn in a 1996 mitsubishi eclipse spyder i cant put it on the steering wheel because the wire will get tangled up when i turn the whhel so i am going to use a button on the left side to push the horn. Any ideas? Thanks!|||Is it seperate from the regular horn? If not just use the regular horn wiring. Or is it an extra horn.