There's 4 wires:
1) Power - Switched 12V source
2) Ground - again...ground it.
3) Sig. In - This is the output from your signal convertor screwed into your transmission. Out of trans signal convertor - into the dakota digital box.
4) OUT 1 - Make sure you use OUT 1, otherwise, the calibration will be so far off, the speedo will barely move.
Take the output from OUT 1 and tap into the 3rd wire on the top of your odometer harness. It is blue with a red strip. This is what will make your odo & speedo work.
Go test it out
You might have to do some small manual calibration, using the "up" and "down" buttons on your dakota box...but that's it!
TH400 Dakota Digital Speedo Convertor Wiring Diagram
