did I buy the wrong tach?

Alws55

Petty Officer 3rd Class
Joined
Jul 28, 2004
Messages
95
The tach I bought has a label on the box informing that this tach is for the following merc motors....is this tach exclusively for a merc. ..this will not work on my 61 johnson 75?<br /><br />Airguide 657-B green & black wires
 
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