Looking at the pic I'd say the box goes on the wall and the wheel with the holes goes up against the rotating part of the dome. If it is meant to be a "universal" setup you will probably have to calibrate it in some way before the computer can read it. The disc with holes looks like it passes through between a signal source and receiver, the software will need to know what distance or angle each on/off pulse represents. Might have to input the dome inside diameter or circumference and set a 0 point. Best I can do off the top of my head.
Best of Luck
Glenhuon
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