I doubt you need to drain the oil, You might get a dribble but if the car has been stopped long enough, there'll be no residual pressur.
I just looked at etk do find where to plug in and I was coming to say the same thing as capex5 or if you can't find or fit a gauge but it seems doable, you could try hooking up to part 18 with an extra piece of tubing.
First things first, if you've got a pressure probleme, damage can be done which should be averted as much as possible. Bypassing the strainer does not seem like a good plan, you'd be forever wondering if a piece of the guides might break and kill the engine.
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