I would imagine that the best place is straight out of the block where the std sensor is, but its near impossible to get at! so some people get the Lexus bolt which is already taped for a take off ,that holds the oil cooler assembly on, and the other option is to get a sandwich plate, which will allow you to fit an oil temp sensor as well!
stupra, i presume that reading is bar? so 29psi hot and 130psi cold
same as mine, but i now have a hot reading of 40-45psi and that's at 100c
I am also interested in the temp readings on the 2JZ GTE i have only had a chance to check mine on short urban journeys and using a bit of boost the temp seems to be 100c which is 10c higher than my old s14 even when thrashed!