All you need is the little speedometer gear. Just give your friendly neighbourhood ford dealership a call and they should be able to guesstimate which one you need. its only a couple dollar part. Otherwise you have to take it to a shop which has a chassis dyno and get it calibrated, then it will be perfect and they can run it on the dyno at the same time. But for a budget just find the gear. When you phone you will most likely need tire size, gear ratio,and type of tranny.
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