The temp sender for the GAUGE is where said, it has a single wire connector, next to it will be a blue 2 pin plug connector, for the ECU temp sender, there is also a 16mm bore pipe there from the matrix output to the head, these are on the head tucked behind the dipstick tube are.
Rearwards of the oil filter is the oil PRESSURE switch, ie the on/ff switch for the oil light in the dash clocks.
There will be NO OIL SUPPLY PIPE HERE, as that is only on 2wd versions, your 4wd has a pipe that goes from the oil gallery on the exhaust side of the head to the turbo.
You will just have a sensor/switch in the block on the 4wd, this can be taken out and a "T" piece put in place, so that both the existing switch/sensor and the new TEMP sensor can both be put in this one place.
tabetha