Well, on my 2002 Cav, my Tach needle was messed up and they had to order a new cluster for me...However I was still under warranty for it so it didn't cost me anything, but having the odometer messed up may be a different story...It's not going to affect the functionality of your car, however when you do go to sell the car, or trade it in, you're probably going to have a hard time if whoever is going to buy it, can't have an accurate reading of the odometer...You may want to see if they can order it, and you put the cluster in yourself...It only takes a few screws to get your dash off, and it's only a 5 min. process after that.
Just a thought.