ROBERTH
GreatGrady Captain
I installed the Johnson High water alarm several years ago and very happy with it. Can turn it off if needed in case you are cleaning the bilge and get it wet.
Johnson Pump Bilge Alert High Water Alarm - 12v Sensor
BilgeAlert Hi Water Alarm, MFG# JP-72303, includes switch panel with beeper and Mirius Technology Sensor, 12V.
www.hodgesmarine.com