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It's possible that you have a leaking valve, incorrect valve clearance or a worn camshaft lobe. Does the engine run smoothly?
One way to make the gauge steadier is to put a restriction in it. I did that by putting some wire insulation stripped from a wire into the vacuum hose. It has to fit snugly in the hose. Another possibility is to stick a threaded stud or a bolt with the head removed into the hose. It works best if there is a long length of vacuum hose between the restrictor and the gauge.
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