1999 40 hp tracker by mercury question

Hoover3425

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Apr 4, 2016
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I am wandering what this fitting is for on the back of the head above my spark plugs is for. From what I am reading I am assuming it is for a temp gauge or a pressure gauge, but my controls do not have these features. I am wandering if it is ok to pu a plug from my old motor in this with loctite and be done with it. I just want to make sure that this should not the into my water pee hole hose anywhere. I just bought the motor and don't want to hurt it
 
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