First: Both speed/odo rebuilders I spoke with (out of Hemmings) quoted normal rebuild is $120 to $150.

Both also said that on my 107 body, the re-install gets weird...the cables and wires are very short and there is no room to get a hand behind it and hook up/screw on, what was fairly easy to disconnect. One suggested disconnecting speedo cable from bottom and trying to make some slack can help.