Need help finding. Spark plug firing per revolution

[sbritt23]

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

 

[Johny25]

You have a 2 stroke so it is once every revolution......... or once every 360 degrees. So if your tach has a degree setting then put it on 360