There is a check valve and spring in the oil filter housing. I would take a close look at the spring. If it has broken it will cause the valve to open and close erratically, causing the condition you describe. If the filter is new, the pressure at the valve will be lower. As the filter collects more and more debris, the pressure at the relief valve will increase to a point that the valve will "flutter", causing the gauge to do the same.
Hope This Helps,
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Bob
"It won't take long, and it won't cost much."
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