Bill;
On my street car I used a trick to run the wire from the horn button on the steering wheel down the inside of the column: I used a 1/4" phone plug and jack in the hub to make a removable connection. The plug was mounted in the center of the steering wheel and, when installed, it mated with a phone jack that I mounted in the center of the steering column. I ran the wires through the column down to a hole in the side where it looped around a couple of times so that the wires were not pulled tight at the stops. If you need two wires plus ground, use a stereo 1/4" phone plug & jack.
The coaxial arrangement allows the steering wheel to be put on in any orientation.