2015-2018 Jeep WranglerThe TrailCal is an all-new, premium product designed for the 2015-UP Jeep Wrangler. TrailCal offers monitoring, calibration, and control features without any modifications to the vehicle. Calibrate for larger aftermarket tires, adjust for gear ratio changes, and enjoy best-in-class monitoring and control features, all without popping the hood. Previously, this option was only available in our handheld Flashcal device, but now you can use TrailCal to get all the features that allow you to set your Jeep up perfectly with your other upgrades.