Build has 2008 Vette LS3 and aftermarket performance transmission with GM performance 19302409 controller & harness. The Can lines have been connected between modules. The transmission module shows RPM, coolant temp, battery voltage. But doesn't show MPH. Has anyone found way get two to work together?
ECM has vss sensor and shows input. But trans setting in the ecm has be (manual) for it to register. When set to auto the ecm vss doesn't register. Never registers in auto trans module.
This setup is in 78 CJ7