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Many gauges have a warning function that you can set to whatever pressure you want. It's really worth paying a little extra to have that. For it to be useful it might need to be set where it is going off at idle though.
The older pressure switch came on at like 2.1 psi, which is essentially useless. The BRZ appears to also just use a warning switch and does not monitor actual pressure, for the dash warning light anyway. Seems like there may be an avcs/avls related oil pressure reading?
So yeah, pull that out and use the plug for the sensor. Keep in mind that a lot of gauges that use PSI for units use an NPT fitting while the stock sender is BSPT/PT. Prosport and Killer B make galley plug adapters that are NPT.
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