Anyone want to hazard a guess as to what I have on here?

I know the bottom is an 'earth', but struggling to identify the function of the other 2?

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temp sensor and fan switch?

temp and pressure ?

Dunno... see, I'm trying to decide if I need to put a water temp sensor in my top pipe, or whether one of these will do the job!

If so, will one also act as a fan trigger switch?

Guess I'll just have to fiddle with it once the rest of the loom is ready.

Level sensor?