Need some insight for spark plug firing revolution

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sbritt23

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I have a 93 evinrude 40 hp and i saw a knock off tiny tach for like 10 bucks and thought what the heck I'll try it out it says I need to set up the firing revolution for it i guess. And I'm reading the instructions on how to do it. Does anyone have any idea what the spark plug firing revolution is for this motor. Either it's 1,2, or 3 thanks in advance for the help
 
You have a 2 stroke motor so it is 1 spark for every revolution. 4 strokes are one spark every 2 revolutions. So you want your tach at the 360 degree setting which represents one spark per rev.
 

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