TPMS
John,
There have been some changes in the '05. I believe there is a "basic" system which doesn't actually tell the tire pressure -- just whether it's within a predetermined range. The other is the "delux" system which, like all previous systems, actually reports the individual tire pressures.
The '03 to '04 system needs an EVIC with the TPMS feature and one emitter mounted in place of the conventional valve stem in each wheel. I think this would retrofit to '02 KJ's and through '04 KJ's (remembering that the '04 will lose "ambient air temp." function unless used with the '04 Liberty EVIC.
If you want to add this feature, I'm guessing you should have an EVIC from an '04(?)/'05 Liberty with the TPMS capability (am not sure that the 05 system is identical; the vendor had changed in '05). If you don't have an EVIC, refer to the 'how to' section for installation. If you do have one, all you need to do is unplug it and replace it; you can sell your old one on e-bay and re-coup some of your expense. They are pretty expensive from the dealer though. Starting from scratch, I'm guessing about $700 in parts plus labor as needed plus tire remounting and balancing expenses. If you're handy and can find the parts used, you can save lots!
If you decide to go ahead with it, I'm sure you can get some good help from this forum! :-k (or at least, lots of sympathy)!! #-o