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I herd ford sells different color speed sensor gears to fix your speedometer being off, I have 3.73s and 18 inch rims, anyone know what color I need?
 

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Isn't your car a new edge? (99-04) they just require computer modification, and rim size doesn't matter as long as you have the proper size tire on it, what is the tire size?
 

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you have two choices

a speed cal unit (plugs in between trans and VSS sensor to modify the signal) or a tune. Make sure your year/trans etc is compatable with the speed cal unit or get a tune to fix it.

rims have no effect, its the tires. If they maintain the stock overall height no change is needed.
 
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