I'm using the AEV ProCal. It can adjust the tire size, recalibrate the new throttle body to the gas pedal, and switch older (2008+) JK TIPMs for a 3.6 fan swap. Another really neat feature - you can use it to easily center the steering wheel when adjusting the drag link (it lights up the outside turn signal lights when the wheel is centered). It uses DIP switches with no screen of its own, but mine works very well and is on the low side for price.
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