I take it you want your steering wheel pad to activate the horn, be it either your air horn or standard horn... And I take it you will be mounting a changeover switch on the dash/underdash somewhere?
You need to find the wire that comes from the touch pad, going to the horn. From there tap into the switch, a changeover style, freely available from Repco or the like. Then from the 2 outputs, one will remain as your standard horn active, the other as your airhorn active. Remember though that airhorns generally require a relay because of the large power draw requirements!
And drama's let me know, and I can send you a sketch of the system!
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