8l90e tutd

[Brads_rs]

I'm setting up an 8L90E behind a 2016 LT1 in an older car. I would like to get the TUTD function to work. I have read other post saying that the hard wire input goes to pin 39 on the T87 controller. I have the resistor values figured out. Is there something in the TCM that needs to be switched? I have looked and don't see anything in the cal that says something like "switch TUTD from serial to hard wire".

Thanks in advance.