I still have the same problem. My swap still reads 158mph even with the newest beta and the transmission switched to "manual." I would think that whatever the problem is it is in the ECU, not the VSS. The VSS is not sending a signal at rest and even if it was totally unhooked and the ECU was getting no signal it should read 0mph not 158mph.
Car runs fine this way and I might cause myself problems if I ever do manage to fix this problem.