Dito on what Marcus said. I have the flashcal however it will only work with one vehicle. You may have to spend the money up front but it's worth it in the long run. You can do other things with the programmer as you make other upgrades to you rig. Also, the dealership can't calibrate your spedo to most over-sized tires (mine charged $90.00 for tires in their range). I researched the flashcal and the AEV Procal. Lots of people on here use the Procal. I went with the Flashcal because I didn't want to deal with the switches on the Procal.
2012 JKU Sport, Rock Krawler 2.5 Flex, Smittybilt SRC Side Armor, Mesh Grille MOD, Sony Double DIN AV Receiver, Back up Camera, Kicker Speaker Upgrade, ARB Twin Compressor, Dominion Off Road High Lift Mount, Homemade Paracord Grab Handles, Nitto Trail Grapplers, Paramount Rear Bumper with Tire Carrier, KC Hilites Daylighters, under seat lock box, Metal Cloak Front Bumper, BARTACT Seat Covers, BARTACT Sun Shade, x20 Comp Winch, sPOD, ARB Air lockers, 4.10 Gears.