Oil pressure switch is located just under/behind the alternator.This is a simple single crimp connection to the sensor. All this does is light the oil pressure light on the dash when the sensor reads low.
If it is a new engine though, I would want the oil pressure light working to be sure. Although saying that the oil pressure level at which it comes on to warn you is very low and TBH a damaging level. Better to have an aftermarket gauge i.e Prosport for about £45.
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