steering wheel install in an s13?

[clean]

went to put on my mugello wheel but couldnt figure how to hook up the horn. on the back of the stock wheel there are 3 brass rings that come into contact w/ 3 brass "nubs" on the colum and the cruis and horn is wired to the back of the brass rings on the wheel. what i think from looking at it is one is a power and ground?, another for the cruise accel and the other for the decel. anyway im just not sure and i messed w/ it and didnt come up w/ anything. the buttons on the sparco wheel just have a pos coming out of em and i know there has to be a ground on it. anyway if i had a 240 manual it would aelp but i havent found one at any stores, just the ones on cd on ebay. can someone shead some light on it. thansk