I just use two or three bands of black electrical tape on the fork legs, light wire run in conjuction with the computer pickup wire. IMO, it looks clean enough (nicer than coiling around), and when it starts getting ratty I just retape it. For the long run to the tail light, I routed inside a piece of quarter inch black plastic tubing sold for drip irrigation systems. It lays right between two of the three cables on my TT, held in place by black plastic clips and works very well to keep the wire out of trouble. From the rear of my TT to the rack mounted light, I just tied the wire to the bottom of the rack.

Nice job there- looks very clean.