Wires from a sensor on a fully rotational servo

Miniature Slip Ring - 12mm diameter, 6 wires, max 240V @ 2A : ID 775 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits for $17.50
Shouldn't be to hard to mount a plate to it, There are larger ones as well.
Hope it helps you!