I drive and 82 240, so we're dealing with the mechanical speedos/odos here. The one that came with my car croaked a few years back in the midst of a cross-country drive. I finally picked up a replacement at the junk yard this weekend. It works better, but often freezes up when trying to turn over the 1's place in the tripmeter. I realize that one of the gears is loose on its shaft, but before I go all the way in there and try to glue it on tight, I'd rather just get an exchange at the J/Y. Question is, how can I test one of these babies? Can I just stick a drill in it and see if it works? In my expereince, different people have different gears that get stuck--is it really a waste of time to get a J/Y unit anyway, as sooner or later one of the gear will come loose?