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No oil pressure.

Best to post this in the Merc forum, we can help you there. When you post again, give as much info about the engine as you can, and let us know the number of wires on the sender.
 
I would install a mechanical gauge where the sending unit is and check the actual oil pressure of the engine. Then ground the wire attached to the unit to check the gauge. If the mechanical gauge says you have goo oil pressure and grounding the wire actuates the gauge, replace the sender.
 
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