I found the 80 inch to be too short, when routed in the original location behind the inner fender. The 100, while longer than the original, worked for me, and had enough length to actually pull the cluster out enough to release it from the speedo. There really wasn't a lot of extra cable under the floor, but I did make a larger sweep than the OE cable as it left the trans. It didn't seem like it was as flexible as the original was...could not replicate the bend the OE cable had at the trans speedo drive without feeling like it was going to kink. I also had issues with the core length, might just be the gear I was using, as nobody else has commented on this.