But their ProCal gizmo does a lot more than reset the TPMS trigger point… If you get your alignment too far out of whack it can be set to tell you when the steering angle sensor is centered. And it can be set to temporarily raise your engine’s idle speed for a few minutes to help out while winching. There are a couple of other features, but you get the idea: if you’re going to mod your Jeep you need one.