Does anyone have any experience to report with the new solid state
bilge pump water sensors such as the Johnson Ultima? Sounds like a
good, no jamb, no cog, idea to me.

The Johnson switch appears to have only two wires and go in series in
the circuit. I'm durned if I can see then how it gets the power to
run its little brain when the pump isn't running unless it has a
little rechargeable battery in it some place. If your boat was really
tight and sat for a long time with dry bilges, could the switch then
go to sleep and not turn on if water got in?

I like the time delay feature. We have a wide bilge sump and, with
run back from the hoses, could end up with short cycling when the boat
rolls.

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Roger Long