The other cool thing about relays is that they usually have multiple
contacts. If you want a cycle counter, pilot light, bell, or whistle,
it's just a matter of wiring it in. There are usually N.C. contacts
as well so, if there was something you didn't want to run at the same
time as the bilge pump, you could do that easily as well.

I'd wire the latching circuit across more than one set of contacts in
case of corrosion.

--

Roger Long