AEV ProCal Module for 07-18 Jeep Wrangler JK & JK Unlimited
AEV's ProCal Module is a hand-held powerhouse! It provides users with a quick and easy way to make a variety of useful recalibrations to their vehicle's computer. Topping the list is its ability to correct for changes in tire size. Anyone who has installed larger-than-stock tires, only to live with an inaccurate speedometer, will appreciate the ease by which the ProCal Module restores factory speedometer accuracy.