I have a Ford Mustang 1995. Is a 3.8 V6 engine, I bought it used. However when I bought it the millage counter had stopped. I went to the Ford Dealer and they told me that I had to find out how many tooth my speedometer gear had. I do not want to get down the transmision to just check (i know I am going to have to take it down when I change the speedometer gear) but I just want to know if any of you is aware of how many tooth my speedometer gear has (my car is automatic by the way).