anyone want to share how the hooked there dakoata box up power and ground is easy i have a 91 camaro so i have the yellow to the output but not sure where to connect ground and how to connect t56 speed sensor and help?? thanks

I just did this but with an A4 and using a TCI transmission controller.

If I had your system I would first try it this way using application #2 in the directions. The yellow wire from the VSS would go to Speed Input Signal. I would put the Purple Wire from the VSS to ground.

I would take the yellow wire from the ECM(B10 in my case) and put it in out 2. I would take the purple wire from the ECM(B9 in my case) and put it in sensor ground.