Air horn install tips on 2020 models

[Boosted]

My wife wants an air horn on her 2020 Expedition. Ideally, she wants it connected to her horn button and the factory horn disabled. Where are some options to pick up this signal for a relay?

 

[Yupster Dog]

Where are some options to pick up this signal for a relay?

Why not use the wire that goes to the Factory horn now for a signal wire?

Gets your air horns working off the steering wheel horn button without having to splice anything.
Don't have to go looking for anything and disables the factory horn at the same time.