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Re: How To Question: Illuminate LED on passover?
The simplest thing I can think of is a reed switch and magnet combination. That's what many door/window alarm sensors use. Put the magnet on the moving arm, and use the reed switch to close the circuit for whatever you want to power.
(My first impression was that you wanted to light up an indicator from 15 Nissan through 22 Nissan...)
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