is it one of the ones at the front wheels or is it the one on top of the rear end? or is there another wire to hook up to? please help. thanks

No, those are ABS sensors. Your VSS wire goes from your transmission to the car's computer.

But if it's an 06 F150 like your user name suggests, it would be the gray/black wire right on your truck's stock radio harness.

EDIT: http://www.avic411.com/forum/viewtopic.php?t=12031

No, those are ABS sensors. Your VSS wire goes from your transmission to the car's computer.

 

But if it's an 06 F150 like your user name suggests, it would be the gray/black wire right on your truck's stock radio harness.

 

EDIT: http://www.avic411.com/forum/viewtopic.php?t=12031

which one will it be on the wire harness thst they sent me? there was a pink wire on the harness. is that it?

I have no idea. It's whatever wire matches up to the gray/black wire when you connect the harness to the factory plug.

Wait... are you talking about the D3's harness, or the adapter harness that let's you plug it into the car's existing radio connector?

I have no idea. It's whatever wire matches up to the gray/black wire when you connect the harness to the factory plug.

 

Wait... are you talking about the D3's harness, or the adapter harness that let's you plug it into the car's existing radio connector?

the one you plug into the factory plug.

So it would be whatever wire on the harness that matches the pin position of the VSS wire. Just plug them together, and look at what wire it is...