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    New Oil Pressure & Water Temperature Gauges don't work....?

    Hi Group, I have a 2019 Mercury 90 HP 4 Stroke Outboard engine, that I have just installed a SECOND set of two gauges in, which still don't work, after a second try.??? These are connected to a Mercury Wiring Harness going directly to the engine. When I turn the key on, the needle of the...
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