Speedometer on LS 3 not working

[60's Kid]

LS3 with automatic trans. I am using the speedout (orange wire) from GM harness to signal on speedometer. Speedo won't work.
Am I not using the correct signal wire?

[JimLev]

What GM connector do you have plugged into the tranny speed sensor?
Pretty sure you need to use the GM connector marked Vehicle SPD for a 4L65E tranny and not the one marked TISS, which I think is for a 4L80E.

[60's Kid]

What GM connector do you have plugged into the tranny speed sensor?
Pretty sure you need to use the GM connector marked Vehicle SPD for a 4L65E tranny and not the one marked TISS, which I think is for a 4L80E.

What goes on the right side top terminal marked out?

[JimLev]

If your asking about the back of the speedo you don't need to connect that.
It's a square wave output that can be used for a cruise control.

[60's Kid]

If your asking about the back of the speedo you don't need to connect that.
It's a square wave output that can be used for a cruise control.

Ok, I think mine very well might be right. I think I need to go kart and do calibration to see it read.