temp vs. press

[JDMFantasy2k]

Ok i just bought a vafc2 and i got a set of high impedance injectors off of tunertoys.com, so i'll be runnin the afc hack for my engine management (until spring at least). So i've decided to pick up a couple more gauges (i'm going to do gauge cluster shroud). I figure i can plumb an EGT probe into my blockoff plate for the external wastegate port, but i'm not sure if i should get an oil pressure gauge or an oil temp gauge.

I've heard that the oil needs to be a certain temp in order to lubricate effectivly (hence i'd like to get an oil cooler with thermostat in the near future) but then again i heard an oil pressure gauge is a good idea too. Any suggestions?