470 Mercruiser Tachometer Wiring

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Mercruiser 4 3Lx Tachometer Wiring | Wiring Library - Mercruiser 4.3

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Mercruiser 4 3Lx Tachometer Wiring | Wiring Library - Mercruiser 4.3

I want to connect a tachometer to my 1974 mercury outboard. It was