Looking to see if someone can point me in the right direction. Just recently swapped trans on 2011 CTS V. Went from a 6L90 to a Manual Valve Body TH400. All gauges read correctly except for the dash speedo. It switched trans to manual and disabled the VSS. I get nothing on the speedo. When I log in hptuners, I do get a speed reading for driven and undriven wheels. Is there a way to direct the speedo to read from the wheel sensor? Would flashing in a manual cal fix the problem as I don?t think the M6?s had a VSS. Appreciate any guidance on a possible fix.