It seems like a lot of posts lately have been about the white face guages. To correct your speedo, you need to change the speedometer gear that feeds into the tranny. I am not sure how many teeth you will need on the new gear though, nor have I figured out where to get this info. I know I have seen charts showing different combos and the correct gear to get, but I don't know where. Maybe call Summit or a Ford dealer and they can send you in the right direction. The gear itself is fairly cheap (10-20 bucks) and is easy to swap out. This is all assuming you have a T-5.
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