I would think your best bet would be something like the scanguage. This forum and the MPGuino mainly focus on pre-'96 cars that have no other options.
The scanguage seems like it should work with both of your vehicles (but if your Liberty is the diesel version [did not know they made one] then it should still work, but some of the guages/displays might not work).
You can read about what it can do here:
ScanGaugeII - Trip Computers + Digital Gauges + Scan Tool