I, too, do not have a tach. I asked about the same thing on the forum, and the general response I got was that it could be done. Unfortunatly, it will probably screw up your title if you take out the odometer. Of course, that's just if you replace the whole cluster. I'm pretty certain you could add a tach from autometer or the like though. Better check with others who have actually done it, though.
