If you are asking about how to use a prop turns to estimate speed in the game, it is not possible. The game is modeled too simply; only a small number of sound files are used to create the screw sounds. Someone asked this before. In RL, O'Kane used this, but I don't think it was ever considered a substitute for the usual methods; more of a supplementry method.
About the periscope index ring. I don't know where you get that. It looks like a definate improvement.
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