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Well, the engines running high and there's tons of pressure. Then you let off, it drops pressure really quick because it isn't forced through the collapsed filter (just means that its more difficult for the oil to get where it needs to go) with enough force at first. Then as the system recovers, the pressure comes back up the gauge goes off...
Think of squeezing a bottle of katsup. Hold it upside down and squeeze, tons will come out. All of a sudden stop squeezing the flow will stop (or greatly slow) then pick up again after a moment..
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