Speedometer Calibrator | Inline | Diesel | Chevy/GMC 2500HD/3500HD (17-19)

Rough Country’s Speedometer Calibration Device is a plug‑and‑play solution for diesel Chevy/GMC 2500HD and 3500HD trucks (2017–2019) that keeps your speedometer accurate after lifting or upgrading tires. It reprograms the ECM to ensure the dash reading matches your true speed.

• Compatibility: Diesel Chevy/GMC 2500HD and 3500HD models from 2017–2019.
• Plug‑and‑Play Installation: Connects directly to the vehicle’s Diagnostic Link Connector Port; setup takes minutes.
• ECM Update: Updates the engine control module, not just the gauge, to maintain accurate shift points and electronic stability control.
• Speedometer Calibration: Reprograms the speedometer to reflect larger tire output for true speed readings.
• Reset to Stock: Built‑in function to revert to factory settings before service.
• Warranty: Includes a 1‑year warranty.

This device helps you avoid inaccurate speed readings when you install larger tires on a lifted diesel pickup, ensuring you’re always aware of your true speed. Because it updates the ECM, your transmission shift points and stability control remain reliable, contributing to safer, more predictable driving. The intuitive, plug‑and‑play setup saves time and money, and the optional reset to stock makes service visits hassle‑free. All of this is backed by a 1‑year warranty for confidence in your purchase.