Hey guys. Need a little help here. I have a 1987 trans am gta with a 5.3 LS, and a 4L60E that I had bought last August. Been getting things fixed up here and there. Well I’ve came to the stock speedometer that doesn’t work. It wasn’t working when I bought the car. Well anyways, the girlfriend had bought me a Dakota digital box for Xmas. And after about a month of searching this site and ls1 tech I think I am just more confused then I have answers. Can anyone chime in and put me in the right direction? It has a “pocket harness” on the engine side from what I was told by original owner. I found where the old buffer box would reside, but no buffer box.Everything else seems to be plugged in correctly even the C207/C221( I think that’s what they are) I guess I’ve read so much, that I’m not sure what to do. Thanks. Hope to hear from someone! I know this is a redundant question from all the posts I’ve read. Haven’t seen anyone with this particular situation.

Well the DD box isn’t installed yet, its the SGI-5 E universal signal interface unit. I was told by a buddy that the LS computer wouldn’t send the right signal to the speedo to read. But after all my searching I’ve read that the computer should be able to. Ok. I will check the swap sites and see what they have to say again. Maybe I missed something. Thank you.

That’s what I have also is the red and blue. I came across something similar pertaining the the pins. I have to go out and check to see if the colored wires match from what I have to what you provided. So your saying I have to get into the computer and change those parameters for it to work? Shouldn’t i be getting something on the speedo regardless? Is there a way to do that other than with hptuners? Or am I overthinking this?

Not sure how related this is, but my odometer doesn’t work either. All the other gauges work.

Ok. Well I’ll go over the wires starting from the speedo and trace the wires to the C207 and see what’s going on. Thank you for the help!