Sits in front of the carb with two thin lines running to it

 

With the pictures it's hard to tell what switch it's for. But it's referred to a ported vacuum switch. More information such as year, engine, what the vacuum lines are going to would help get a better answer. Sometimes found on the thermostat housing other times in the intake manifold.

 

Thank You! It's on an 1983 v8 CL,It looks like it's on the manifold, Thanks again!

 

It's some sort of vacuum ported temperature switch that's installed into your thermostat housing/water outlet. Your service manual will have much more info about that. If you don't have a service manual, get one.
CD ( )
Hard copy ( )
By the way, what's up with the bare wires on the other sensor next to it and the (WTF??) solder job on the idle stop solenoid body?

 

Thanks! Yea just about all the wiring has to be redone on this thing