Geoff, we did something wrong when we install my speedo back into my tcase after installing the SYE. The speedo worked for a few miles and then just dropped off to zero and hasn't moved since. I opened it back up the other night and the gears are completely chewed away. It is destroyed, but I wanted a new speedo anyway since mine is way off with the 33s on my XJ and still running stock gears. Now I have a reason to buy a new one, but I have to figure out what we did wrong on the original install. The guys on NAXJA think the o-ring may have stuck and the gear seated crooked, but I don't know. What I do know is that my speedo doesn't work at all right now.