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I don't see why they wouldn't work, but you are going to have to figure out how to mount the sensors. The WRX/STi always had an unused oil gallery plug which you could easily use for an aftermarket oil pressure or temperature probe, I don't know if the FA20 does or not. If the Defi sensor is 1/8 NPT it should work.
You can also replace the factory oil pressure sensor with an aftermarket one. The factory one usually doesn't buy you much because it comes on after it's already too late.
As for the other functions on the display I think it's just a matter of tapping the right wires.
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