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The Flashcal is the most advanced, & yet the most easy to use, tool on the market for recalibrating the speedometer for your JK Wrangler when you have upgraded tires, gears or axles on their rigs. Flashcal provides a quick calibration solution to ensure the Jeep is dialed-in properly. If you are looking for more adjust ability your Flashcal can be upgraded to the Flashpaq online with a simple internet update and gain award-winning tuning straight to your device!