Having some trouble with data/trans in limp mode. This is a 72 blazer that came into shop to finish for customer. harness is made by Modern vintage.(still waiting on a reply from him about wiring diagram.) Engine OS is 12630501 Trans is 24236195 engine starts and runs fine. data looks normal on ecm side for the most part---3 things I noticed--speed reading 158mph, trans showing in gear, brake switch shows invalid. On tcm side, vehicle speed reads correctly, as well as brake switch, however most data looks like something is unplugged. (tft=-40, no engine rpm,etc.) trans has 12v on pin E. no trans codes. ecm has a few codes looks like related to the swap. not sure what to look for next, any help is appreciated. I can command first and second gear with scan tool