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If the gauge goes down, when you shut it off it is not stuck, but it may be a low pressure gauge. You can substitute a gauge with numbers that goes up to 80 lbs or so, and that should tell the story. If the gauge is original, then it means that you have adequate oil pressure even at idle. Idling any engine for sustained periods of time is not good for it, however for shorter periods like for cooling down after working it is good for it. With the older engines that had troughs in the oil pan and “dippers” on the ends of the connecting rods, idling for a long time is not a good idea, as some parts (like piston skirts, wrist pins, and cylinder walls) depend on oil being splashed about by the churning of the engine. On these engines the oil was pumped into the troughs and a few select other places, but not many. On the newer engines with drilled crankshafts and connecting rods, this is less of a concern because the oil is being pumped through all the passage ways as long as the engine is turning, but at a lower volume and possibly pressure at idle. Low speeds equate to low oil pressure and volume, but also less stress to lubricated parts (unless they are under load at idle which is a no-no). It won’t hurt anything to “kick it up” a bit off the very slow idle if you are going to idle it for more than just a few minutes.
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