Droped the pan today and the pickup looks great. Oh well needed to change the oil any way. Next will be oil pressure sending unit and power steering fluid.
-I would be looking REAL hard at that pickup and pickup O-Ring for a leak. It sounds like the leak is coming uncovered during cornering, and the air being sucked in is affecting oil pressure. While the non-swing arm oil pans ARE affected by left hand sweepers in any event, you should be driving the car HARD for that to happen, not normal light street movements by any means. This would indicate something further up the pickup is at fault- my guess is the seam at the pickup head to pipe, or the perhaps at the pump inlet, but that would be due to the oil slosh changing, not the oil level changing.
-Power Steering Fluid would have ZERO effect on the issue at hand. Hell, if the pump fell off it wouldn't affect your oil pressure gauge.
-Sending unit is unlikely, wiring is much more likely. Something is physically moving or being moved and causing this issue. Sending units which are defective will display incorrect information consistently 99% of them time.
