Yeah. I would just get oil monitoring in first, then consider what else you need (if anything).
Given that your oil is highly unlikely to overheat on the road, oil pressure monitoring is probably the priority of the two. The good news is that tapping into the oil gallery under/near the alternator is pretty easy.
Having said that, I like monitoring oil temp too - particularly as a good guide to when I can give the engine moderate or full right foot. Oil temp comes up a lot slower than water temp. If getting at the rear gallery plug near the turbo is too much of a PITA job with the engine in the car, you could potentially look at a plumbing T-piece off the front gallery so you can fit pressure and temp sensors. The temp sensor might read a bit cooler that way, but super-accuracy is probably less important than overall trend.
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Also - I think some Liberties have a water-to-oil cooler directly above the oil filter (copper coloured assembly with coolant in/out). If yours has this there is already some coolant-based oil heating & cooling going on. I believe a different water pump assembly is also required for that one.
For reference (noting oil temp trends above), my forester does not have that water-to-oil cooler.