The white cable must go on narrow, the black one goes on the neckboard. In my case, the white was on narrow and the black on wide, which led to image errors.
i literally just did this on my ms8 25 which is identical to an ms8 29. narrow and wide are for your horizontal width. start with that connector on normal and adjust your h size. if you cant get wide enough with that, plug the wire into the wide pin.