If it sounds like too much trouble or too expensive, my only advise is to go ahead and do it. I got my first car 9 years ago- an 81 242, with the odometer broken. I figured there were better ways to spend the money, or that since the mileage was already wrong, I wasn't too bothered with getting it fixed.

Well, 9 years later I still have the same 81 242 and while I wouldn't know how far the car has been, I wish I knew how far I've been with the car.