On the KJ, that may be the case; or any vehicle with an overhead console. On my Charger, however, the EVIC is actually a screen that is part of the instrument panel, not a large autonomous unit, and cannot be added or removed, even if you buy an EVIC equipped gauge cluster. It is more of a screen which interacts with various components of the car, which all interact with the CANBUS computer network. It's a very complex vehicle, which renders aftermarket part swapping impossible on everything, even stuff like AMPs...the stock AMP interfaces with CANBUS...of course. This being the case, it has receivers in the car to communicate with the TPMS valve stems. I had initially assumed this to be the case in the KJ since I have the full 10,000 page LX platform service manual - YES, ten thousand pages (I told you it's a complex vehicle) - and am familiar with the LX in and out, but in the absence of having a 2006 or 2007 KJ service manual, and having had my Limited equipped with the TPMS from the factory, I have not yet verified the systems involved on the KJ. That is why I recommended he read the Service Manual once he got hold of one to make sure this is the case. I could only assume it worked the same. The more I think about it, the overhead unit COULD have the equipment to communicate with the sensors, hence the added cost and need for a totally different EVIC just to display the pressure, but I still doubt there is nothing inbetween. These sensors have a very limited range on them.