Join Date: Jul 2008
Location: Jacksonville, Fl
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It's all in how it's wired up. Generally, the power for the tach and gauges gets turned on when 1. the switch is on AND 2. when there is more than 5 pounds of oil pressure. As to how the alternator is wired, it might not need that signal from the oil pressure switch to come on. My old Perkins does. No oil pressure, no field voltage, no tach, no hour meter.
The same is true on the big boat's Volvo. Everything is a function of the keyswitch and the oil pressure switch. Nothing moves until those two conditions are met.
As for your alarms, I wouldn't put a huge bet on them working, either. Nearly everything electrical/electronic on more modern engines is predicated on having the 'ignition' switch on.
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