Installing a horn button in Racemark wheel
 

I have a racemark wheel with the horn button missing. I checked under my front fender, and the horn is still there, so I'm guessing this should be a somewhat straight forward hookup. I need a horn so my car will pass safety.

I'm not sure if the button size on the Racemark is the same size as the MOMO, and I also have no clue how things are supposed to go together in there. I remember a thread I read on pelican going over horn button instals, but I get so many hits when I use the search feature it is hard to sort through them all. Any help would be great.

Here is a picture of my wheel:
http://forums.pelicanparts.com/uploa...1363560417.jpg
http://forums.pelicanparts.com/uploa...1363560462.jpg

Inside where the button should go:
http://forums.pelicanparts.com/uploa...1363560500.jpg

What I think is the wire the horn button should hook up to??? If not I have no idea what this random wire coming from under the dash is:
http://forums.pelicanparts.com/uploa...1363560558.jpg

For what it's worth, I think I have the same Nardi adapter as in this thread: http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/261059-wtb-early-momo-steering-wheel-hub-non-rib-style.html.

The hole in the middle of the wheel is 2.25", and I'm under the impression that the MOMO button is 2". Can someone please confirm this?