Yep ,its indeed the black with orangestribe,
On mine i found the wire in the bulkhead plug,
but i never got it working great,
Mine would work fine up to around 4krpm, and it would then just fall to zero again,
That could probbely had been fixed pretty easy, but i never got around to do it.
It did not bother me much ,as after 4krpm i better hold on to the steering wheel, when it broke traction, pretty easyly
http://www.vems.hu/wiki/index.php?page=MembersPage%2FSkassa/Skassa