I just installed a Pressure Gauge:
DIY: Oil Pressure Gauge
The readings in pressure at Hot oil with a 5W40 Synt are:
At Idle 20 PSI (The service manual recommends 15PSI)
At 2000 RPM 60 PSI (The service manual recommends 43PSI)
At 3000 RPM 80 PSI to 90PSI at 6000RPM
I think that it's so good excluding drop in pressure using Banjo Bolts and an Oil Cooling system.