I split mine up. I already had the relay from my previous aftermarket horn, so I also mounted it on the forward AI post. The rear post holds the relay for my driving lights. Then I mounted the compressor vertically under my seat. I have so many wires now (gerbings plug, battery tender, and the two relays) that I also mounted a buss under the seat. Now I just have the two wires on each battery terminal instead of 6. Only difference from Lazyrider's setup is I ran the ground back to my buss, not to the frame. I used some 1/4" clear tubing I got from work to connect the compressor to the horn.
