Buzzer going off

by Chad DeVore
(Picayune, MS)

I have a 2008 4.3 Mercruiser, I changed the oil and filter. When I start the motor an alarm goes off. I'm assuming this is the oil pressure switch but gauge shows 40 psi at idle. I checked the blue wire to oil sensor and it was connected. Am I overlooking something or could this be another alarm?

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