I offer this first photo in total humor only, only a headlamp and no taillamp. Both hub and light grounded to the fork, so only one wire about 5 inches long is needed.
Simplest wiring job I have ever done.
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On my Lynskey I have glued the wire to the taillight inside of the fender. So the wire is not seen aft of the bottom bracket area. The wire comes out near the bottom bracket. There are a couple quick disconnects there. Then the wire is less than pretty because it is wrapped around the rear brake cable that is attached to the downtube up to the headlamp. I do not have any photos of the taillight wiring.
Others have used tape but I chose to use glue for the wire inside the fender.
The headlight wiring on my Lynskey is zip tied to the fork blade from the tip of the fork up to the fork crown, then plugs into the light. I took this photo before I added the taillight wires that plug into the light. If the light wiring looks odd, it is a Luxos U that has an extra wire up to the handlebar for the switch and USB port.
The photo below shows the wiring where it plugs into the hub. If the photo is a bit confusing, there is a Tubus Tara rack on the fork when the photo was taken.