2010 mercury 90 hp efi

by Robert
(New gloucester, me)

Critical alarm. Check engine alarm. At startup get an initial beep with a constant beep for 5-6 seconds. Thinking it might be oil pump. Bought a vessal view and oil pressure doesn't do anything . Replaced thermostat, was stuck, replaced all sensors up the line. Oil pressure switch doesn't work but new. Can this only work inline with the sensor after it. Saying that if the pump doesn't register than neither with pressure. Ty for your time.

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