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The speedometer in my 65 shows 55 mph but I'm actually running 65 mph. I've been told that I'm ~ 2 teeth off with the plastic transmission gear. Do I need to add 2 teeth or go with a gear that's 2 teeth smaller?
What do you have now?? I believe LICS sells the gears.
You just need to recognize that there are two different size DRIVE gears that could be in the trans output shaft. The size of this gear limits the plastic DRIVEN gears that you can use. So pay attention to this when ordering.
If you tell us what you have we may be able to offer additional help.