85 HP mercury force tachometer

Pan84

Seaman
Joined
Dec 11, 2009
Messages
66
Hello
Today i have electric question.
It is back side of tachometer

b87c557a9b01.jpg


The middle is ground, flat is positive, but where connect wire from motor. I thinks upper wire from engine and bottom positive ? Who know how connect tachometer on 1986 bayliner capri with outboard 1987 mercury force 85 hp?
And what can happens, if i connect it wrong? I will burn something?

Thanks
 
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