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post #3 of Old 11-17-2019
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Re: Help figuring out this engine buzzer circuit

Yep, I'd agree, oil pressure. Turn the engine over and the oil pressure gets higher, turning off the alarm.
Switches come in normally open and normally closed. You just pick the right one for the job.

"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.
“Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.” ― Kenneth Grahame, The Wind in the Willows

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