Pulling out hair - This is a '08 Tahoe E38 / 6L80E into an older truck. I've tried every setting under speedo parameters I can think of and still no VSS signal on pin 57. Truck drives / runs. I have the GM LAN working and have the Replicated TOC signal going into the E38. I've verified that the Replicated TOC signal is a pulse going into the E38 pin 71. Still no VSS output. Anyone want to share settings?