Route the wires neatly, allow enough slack for all the movements and fasten with two wire-ties. The top wire-tie is just round the wires whilst the lower one goes through the hole in the Neck base. Don't try and stop the flow of electricity just gently pull them tight enough to hold the wires in place.
Plug the eye leads onto headers E0 and E1, photo-76, note the black wire should be towards the outside of the board.
(E2 and E3 are spare digital outputs).
Clamp the speaker wires in the connector, photo-76.