2006 115 DFI Warning System

[dean4now]

I have a warning system sounding four beeps every 2 minutes.
This is for low oil in tank or water present in VST. I have a full tank of oil and drained both drain points on the VST. No water in fuel. I checked both sensors for continuity. They both are are reading no continuity. I inspected all grounding points as well.
Has any one had this circuit fail in the PCM?

[boats.net]

If switch test good then check continuity of wire between switch and ECU to see if have open circuit in wire.

[dean4now]

After further testing I found that the magnet came off of the float inside the oil tank. I guess that Mercury has seen this problem many times.
The Magnet / Float will close the switch as the oil is added to tank. When tank is empty or low enough the Magnet / Float will open the switch causing the warning system activation. I tested and found no continuity. I removed the senor or switch, applied a small magnet and the warning system deactivated.
Fix - replace oil tank
Thanks,
dean4now