Classic Thunder Road GPS Speedometer Plug-and-Play Modules

Classic Thunder Road GPS speedometer plug-and-play modules ensure you'll always have an accurate speed reading. Changing your gear size or tire size on your vehicle can alter your speedometer's speed reading, sometimes up to 10-15 mph. Not anymore! These modules get your speed reading from bouncing a signal off of satellites that mark your global positioning instead of getting readings from your transmission. This means that you'll always be accurate and always be calibrated, no matter what changes you make to your vehicle (tire size, gear size, aftermarket transmission, etc.). The modules work with any electric speedometer. Show Less