To the OP,
A dash button is NOT stock for your horn button. It should be part of the steering wheel assembly. Why was the dash button installed instead of bringing back the steering wheel button? Is there a wire running down the inside of the steering column?

Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.