Let's play "why doesn't my script work?"!

[Romulator]

Assuming the wheels function similarly to the levers and the wheel that you turn to work the burner near the end of the main game, wouldn't script calculate it as the wheel end positions being at -1 and 1?
And if not that, then maybe similar to the cogwheel levers in the sewer? They end at 0 and 2.

What you could also do is add Debug Messages in the coding of your 1st, 2nd and 4th wheels. You may through this be able to determine exactly where your code is going wrong.