1984 mercury black max 150 wiring for gauges

Summers479

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Apr 21, 2023
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I bought a 94 22ft skiff that someone had replaced the motor with a black max. Idk what was originally installed but I'm in the middle of working through the gauges as I only have the key switch functionally working (minus it does like to stay on even with the key off) boat wiring is new to me in general, I'm curious what wires the tach, rpm, voltage, and oil temp/pressure gauges hook up too on the engine side?
 
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