If it runs you DO have oil pressure.  This motor has a conventional
low pressure oil pump that lubricates the main and rod bearings etc.
The low pressure pump also replenishes the HIGH PRESSURE oil pump
without which the electric over hydraulic fuel injectors will not
operate.  It is impossible to kill this engine through lack of oil
pressure.  The oil pressure gauge is fraudulent.  Although what is in
the dash appears to be a gauge, the sending unit is merely an on/off
switch.  The sending unit is located in the high pressure oil pump
reservoir in the top center of the front of the engine.

Hope this helps.

Don
www.donsautomotive.com