Find the Calibration Devices you need for your 1999-2003 Ford 7.3L Powerstroke. Whenever you add larger tires and/or change the axle gear ratio you can run into issues such as the speedometer reading incorrectly and erratic transmission shifting. A calibration device is powerful user interface that plugs into the OBD port and lets you recalibrate your speedometer while also restoring accurate shift points and proper function of the electronic stability control. Calibration Devices are available for a wide variety of vehicle applications. They easily install in minutes, and some offer the ability of being updated via the internet. Furthermore, they provide the option to return the vehicle back to stock settings if ever needed. Calibration devices can be an essential tool for many truck enthusiasts. They allow you to calibrate your truck for large aftermarket tires, read/clear diagnostic trouble codes, adjust your speed limiter, and more. Shop all the top brands such as Hypertech, Superchips, and more!