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You must use different speedo gears, Ford makes speedo gears with different number of teeth, the amount of teeth on the gear determines what the speedo displays.Usually for every 1 inch of over size from stock tires will throw the speedo off by about 5 MPH. Usually a change of 1 tooth size is equal to 5 MPH. Hope that helps.

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โˆ™ 2009-10-23 19:43:38
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Q: How do you recalibrate the speedometer of a 1994 Mercury Grand Marquis if you put 22 rims w low pros?
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