Combination Oil Sender. Why does no one talk about this?

SonicVQ

There is a third option:
Remove the low oil pressure switch (it turns on the light at < 5 psi!!)
and install the gauge.

As I see it, since you have a pressure gauge, you can detect low oil pressure before the light turns on... for example < 14 psi.

The oil pressure switch is not used by the ECM.

The oil pressure switch is wired directly to the IPDM/ER and when it sees low oil pressure, the contacts close and that ground the signal. Then the UPDM/ER sends a CAN bus message to the cluster to turn on the red low oil pressure light.

If the switch is unplugged, it never get grounded and the low oil pressure light will never turn on.
BUT you have the gauge, so nothing to worry about!

I did this on my G37 just over a year ago when I installed my oil pressure gauge.