Unfortunately I am unable to place a call on this here myself but others see you have requested a call and may still call on this here.I can however continue here.
If you bump the throttle to around 700 or 800 rpm.Your oil pressure should be in these ranges:
Oil Pressure - Minimum - Hot
...................... 41 kPa at 1,000 engine RPM (6 psi at 1,000 engine RPM)
.................... 124 kPa at 2,000 engine RPM (18 psi at 2,000 engine RPM)
.................... 165 kPa at 4,000 engine RPM (24 psi at 4,000 engine RPM)
Since you are dropping to the 10 psi at 500 rpm this is within range but the gauge may not be fully accurate at 10 psi.If you have not had a manual engine oil pressure test done this should be done.If there is an issue with the actual engine oil pressure this will need looked into and repaired as soon as possible as low engine oil pressure will damage the engine internally.This can be a plugged up pick up tube or sludge build up or even worn engine crank or cam bearings or an issue with the oil pump itself.
Since the alarm is going off the computer still sees an engine oil pressure issue and the sensor is o.k. as it was replaced and the gauge is working so this usually does indicate an internal mechanical fault.
If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service,your 5 star rating is appreciated.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.