help with cluster wires

hi, I was about to install my new aftermarket Tach and I found in another forum a small thread of how to do it ,

anyway, after I took out everything , in that forum the photo is like this..





but here what I found in my car "a 2003 GT auto V8 btw"



which are not the same....so, what I wanna know is the chart/diagram/names etc of the wires.

also which one is the Tach signal wire, so I can hook my aftermarket to it , according to that thread.
it's an electric gauge btw
thanks.

well my friend as I think the first photo for mustangs "before 99-04"

and here is a link for the thread I took the photo from " hope it's OK to post links for other sites. if not I am sorry in advance "
http://www.moddedmustangs.com/forums/electrical-wiring/48019-how-install-aftermarket-tach.html

hope it's helpful to get my answer .

and I am still looking for the wire... but still no luck .