Speedometer Calibrators & ModulesIt's usually a good idea go make sure that your vehicle's speedometer is reading correctly when you change tire sizes. Unless, you know, you enjoy rolling through school zones just fast enough to catch a LEO's attention while your speedometer reads 15mph. To save yourself some headaches after your tire swap, your best bet is a dedicated speedometer calibrator or module, especially if you're not interested in tuning or monitoring. These devices make it easy to adjust your vehicle's ECU settings to get your speedometer reading correctly.
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