Whats this plug?
 

I was under my hood today because my top radiator hose is leaking and I saw this plug that is coming for the bottom of the radiator.. I dont know what it is.

Thanks for the help

Coolant temp sensor?

Im not sure... Im water temp on my dash dont work.. I was told that it was the gages. because that the volt and the oil pressure all dont work

Its the #2 water temp sensor.

humm so maybe i should plug it in... I found the wire that should to plug into it. I think. Its the same type of plug (but female) its ran right by the radiator

Yeh, plug it in, see what happens. Maybe your gauge will suddenly work, or maybe you'll gain a bunch of horsepower...it's a surprise.

on the gsl-se and the FC, mazda uses this sensor to basically turn the emissions system on