Bob - I have the manual 3qt, so I can't be of any assistance if it's a wiring related problem. I believe though, that the elec valve allows the
oil to return to the Accusump even with the unit switched off. This sounds like your situation where the unit has filled itself but is not discharging.
In any case, when empty your Accusump showed 7psi.
What does it show with the engine switched off?
What does it show after you have activated the solenoid?
Can you hear
oil "gurgling" in the
oil galleries when you switch the solenoid on?
My car has a 7psi air pressure, and it's enough to drain the whole 3qt cylinder.
One more thing - my Autometer Ultralight 0-100psi oil pressure gauge fluctuates very slightly in corners. I know this to be a fault with the gauge rather than the engine because I have a separate oil pressure sensor feeding info to my Motec Data Aquisition system. I believe the Motec before I believe the Autometer gauge.
What brand / style of oil pan are you using?