Is this with the car moving or still? The only time I've had a jumpy needle is when the oil level was low while driving. An open bypass in the oil filter housing will cause the oil pressure to go up slowly as you increase throttle and go back down to almost zero at idle. A restriction will cause a slow gauge reaction.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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