2010 Camaro 6L80 Swap
#2
You are not alone with this problem. I am going to use a Speedhut speedometer that uses the signal from the GMLAN communication wires. Maybe Dakota Digital now does the same thing. Some are experimenting with pin J1-57 on the E38 ECM. That may or may not work. The signal may have to activated in the software using something like HP Tuners.
#5
TECH Resident