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First, spilling oil like that is normal.
If you want to minimize the spilling, just wait a few hours after you've driven the car or...overnight.
Yes, I realize that some people recommend running the engine just prior to draining the oil, but you still got a shitload of oil sitting in the oil cooler which isn't going to be removed in a normal oil change.
Second, always check your oil pressure with a known, good mechanical oil pressure gauge.
Stock oil pressure senders tend to go back pretty frequently, so always confirm first.
-Ted
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