ATPL holder here on airbus types.
The airspeed can jiggle a bit but the altimeter and vert speed should not.
the alt and v/s are measured by static pressure so less susceptible to gusts whereas speed measured by combo of static and pitot pressure.
RPM obviously the prop is a big flywheel so should not be big fluctuations and the connection from prop to gauge is mechanical
But i never flew spits........sigh
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