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Setting up tachometer

Hello everyone, I purchased a small hour meter/tachometer. It has one wire that wraps around the first spark plug wire. Engine is a1992 2 stroke, 3 cylinder Yamaha. My question is do I set the tachometer to fire once per rev. Or does it fir twice per rev. ? I’ve looked at different threads and found a lot of different answers. Some even refer to the number of cylinders making a difference. But it just goes on one plug wire. I’m hoping someone here can help me out with the correct answer. It would be greatly appreciated. The more I’ve read the more confusing it gets.
 
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