Has anyone retro fitted a 2013 illuminated shifter into a 2007 S80? For the life of me cannot figure out where to plug the ribbon from the shifter for it to get the signal for which gear it is in.

You need to replace the circuit board in the side of the shifter with the 2013 version.

@VolvoMike - So pop this module off the shift mechanism, replace with new one, with ribbon clipped under the white/brown clip in this pic?