A1 G60 Swap speedo cable

Hi I have recently removed A G60 from a syncro. I am looking for tips on a few things. First I am going to Be installing the complete harness out of the syncro in to my Rabbit. Head light to tail light. I am shaving 3 inches of off the passat dash to fit it into the rabbit. No problem there. The problem I first have is how do I adapt the speedo cable to the tranny. The wiring is no problem as well. Ok maybe just one thing on the wiring, I have removed the abs/all wheel drive computer. It also has the harness for the heated seats in it. Will I need to use this harness for anything. Any info would help me here thank you in advance. FlyGTI