Please keep the realism!

[flyingblind]

There is probably only one way to resolve differences regarding such minutia of realism is to try and find some of the last remaining pilots who actually flew the planes. Sit them down and show them both versions and ask them which one in thier recollection seems more accurate. Any one have a suitable grandad or great grandad?
No, I can't prove the jumping needles are accurate any more than anyone can prove they aren't. From my experience of mechanical speedometers and rev counters there is more likely to be erratic movement than none at all. Certainly such movement would be the result of external forces on the instrument rather than inaccuracies within it so movement would vary accordingly. How much is down to the developers.