For lack of a better place I install the compressor in the air filter box and the horn on the left side of crash bars. May move horn some where else later.
OEM horn switch switches the negative and use 30 amp fuse and relay.
I removed the evap canister from the right side and put the compressor there. Bought a longer hose and mounted the horn part where the oem horn is. I think i just used zip ties to mount the horn. Ill try to get pics of it later today.
that looks almost exactly like the Stebel I installed on my Rocket. I installed mine where the original horn was located, with the addition of an additional bracket. I initially separated the compressor from the horn, but there was too much loss of horn volume..
**NOTE** This is on a 15 Touring. Not sure of the differences from a Roadster.
I did purchase the wiring harness from Revzilla with the horn. Maybe not completely necessary, but I am in no way an electrician. lol
Pic 1:.I removed the evap canister and the piping, and mounted the compressor in the evap bracket.
Pic 2 and 3: Removed the OEM horn and mounted the new one in the same location using zip ties through the holes in the top of the horn going around the existing horn plate.