Well if you saw all those posts I'm guessing you searched. And under that search Stazi's post would have turned up.
From
this post.
Well last night I went ahead and installed the fitting for my Oil Pressure gauge into my block.
The right place to get it is at the main Oil gallery feeding the crank!
The other spot high up on the head doesn't give you a true reading as it is after a restrictor plate.
the correct place to tap in is behind the A/C compressor on the Duratec.
3 bolts loosens the A/C compressor, and with the belt off, and also unscrewing the A/C line that's joined to the front crossover coolant pipe you can move the A/C compressor forward towards the radiator enough to see a plug to the left of the oil filter connection and a little under the stock oil pressure sender.
You need to use an 8mm Allen wrench to remove the plug, then install a female/female reducer and then a 90? elbow followed by the reducer you get with the Mechanical Oil Pressure Gauge kit and then finally the compression fitting.
*JOKING* and then install them for me. I Did Search and found lots of helpful information. But i severely lack in this category and that's why i am asking for extensive help. 