Tacho wiring Mariner 40EL signal wire?

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SAABologist

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I am adding a tachometer to the 1987 Mariner 40EL (6E9 series). I was reading in some old posts elsewhere that a special factory tacho is needed, or something about the need to add a capacitor. The tach I bought has speed ratio adjustment based on the number of poles in the stator/flywheel. So my reading has left me a bit confused. Here are my questions:

-- There is a green wire up at the CDI module with a bullet connector that appears to plug into itself. Is this green wire on the Mariner 40EL for the tachometer?

-- I guess the wire for the tach is up at the controls in the loom of wires with the ignition key?

-- If that's the correct wire, how do you connect it to the tach considering it's plugged into itself?

Thanks for any comments.
 
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