I have my Muncie apart and I wanted to put the right drive and driven gear combination in to make the speedometer work again. I have read that most Muncies have 8 tooth drive gears, but how do you know? If I count what I think are teeth, I don't get 8. I get 6. I have never heard of a 6 tooth drive gear. There are no painted marks on it either. So, how do you count the number of teeth on a worm gear?