Have you at least tried to eyeball the leak? I had an old pickup that behaved exactly this way. The pressure was actually fine. But the pressure sensor itself WAS the oil leak. While driving the pressure was high enough to keep the light off despite the oil blowing by the sensor. At idle, the escaping oil gave the sensor a bad read of the actual pressure.
I replace the sensor and poof - no more leak or pressure light. I don’t think this is the most likely scenario but its worth a look.