well i am glad you got yours taken care of.
but that's not possible on mine, it bottoms out on the stud before it could hit the gauge face or anything else. i pulled an instrument cluster from a truck in the scrapyard and still have the same problem, so now its down to wiring or the ECM itself. my speedo sits at 0 with the truck off, at startup it goes to about 20 mph. when the truck is in motion it may creep up to 35 mph, no matter how fast i am travelling. i have replaced the speed sensor twice, tested with the scrapyard cluster and need to test the wires next but i need a second person to help me there. if the wires from ECM to VSS test good then i need to find the wires to the cluster itself, if those are good, then its time for a new ECM.