First thing to do is inspect the tractor, do a compression test, look it over really well and try to determine if it has around 1500 hours on it. If hours are way off, the tractor should show signs of wear, unless it was misused. If its a mechanical tach, pull the internal cable, not the housing, you can usually slip a new cable into the old housing. Second, skip the salesman, contact the dealership manager or owner, they may ship you a cable for free, they may also have a video of the tractor running, might even show the tach, many places either photograph or video items in for repair or prior to shipping to protect themselves. Thgen you need to decide if you still want the tractor, if not, you can try to stop payment, work out a return with the dealership, contact your credit card company if you paid by credit card, or talk to your or a lawyer. Usually to file suit against them, you will need to hire a lawyer in their state, and it will not be cheap, also check the dealer website, or any deal paperwork on the tractor for any type of return policy, or item received not as represented, which is what you are claiming. You might also want to talk to the previous owner, but he could be the culprit, he might be able to tell you how long the hour meter has been dead