The relay in your picture is likely a relay with only normally open contacts, also known as form A. Look for a form C relay, one with five contacts. Technically form B, with only normally closed contacts is what you're after, but form C, with both is more readily available. Any 5-pin automotive cube relay will do it, and you can likely have it today from an auto parts store in town.

Wire the coil of the relay in series with your normally-closed float switch between ignition-switched battery and ground. Then wire the normally closed contacts of the relay in series with your warning lamp.
--
Art Benstein near Baltimore

These jokes should be in Alt.ernating

I'm shocked that you said that, you could use some en-lightning

Where the circuit breaker for this re-volt-ing thread?

We should all have more resistance.

Perhaps if we switched to another topic.

I just thought I'd zap in and relay my disgust at these puns.

The amount of contributions to this thread is AMPle

My sister would enjoy these. I'll contact her and relay them.

I was considering adding to this but I expect too much RESISTANCE.

Yeah, we've just lost the spark in this thread.