I am doing my D2 Install this weekend. I have already moved the blue antenna wire to the empty slot and now All i need to know is where do I connect my Speed Wire to? the manual says I need some sort of Additional Device. What do i do?

Does the stock radio have speed controlled volume? If it does, the radio harness should have a gray/black wire in it. That's your speed sense.

Thanks... How About the Back Up Light Wire??? ANd yes my Truck does have the speed sensing radio.

Reverse is black/pink @ the taillight, but you can sometimes find it in the driver's door sill.