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E been a while since I did mine but it is a pretty simple cuircut. the main horn wire comes up the steering column and goes to the horn button. Another tab on the horn button needs to be grounded. As the whole steering column is already grounded to chassis, its just a matter of attaching this tab to the hub somewhere . Often the hub comes with a grounding ring(with a dedicated tab), that the other horn wire connects too (that goes between the wheel and the hub). If this ring is missing it's not a big deal. On last car I just fitted a ring terminal to the grounding wire and just put it on one the bolts, so it was sandwiched between wheel and the hub. Others tap a thread into the hub wall(PITA if you ask me) and then ground it that way.