The Edge EZ Speedometer Calibrator puts you back in control when you upgrade to larger wheels and tires. Whether you’re running 35s, 37's, 40's or going all the way up to 50's this is the fastest, easiest way to correct your speedometer and get your Ford truck driving the way it should. No more inaccurate speed readings. No more second-guessing. No more risking a ticket because your truck can’t keep up with your build. Dial in your setup right from your smartphone. Adjust speedometer calibration, fine-tune or disable TPMS warnings, even correct your fuel gauge and distance to empty for larger aftermarket fuel tanks, and bring your transmission shift strategy back where it belongs after adding oversized tires. It’s quick, it’s simple, and it just works. No flashing. No complicated installs. No PC required. Just plug it in, set it, and drive. And when it comes to your warranty? You’re covered. The EZ Calibrator leaves no trace behind, so you can make adjustments with confidence.