Temp Switch Question - too many switches/sensors!

[NC_John]

Well, since my weekend remove, repair and reinstall over last Thanksgiving has now entered month 5, I'm struggling a bit with details. I didn't document enough thinking it was going right back in.

My issue is I have three temp sensors/switches and only need two but don't know which two I need. I think one is for the idiot light, one is for the temp gauge and one was for the TCS system which I removed from the engine.

I have a sensor/switch port in each of the cylinder heads and *think* I recall having one on the stock intake manifold (since removed and replaced with an edelbrock).

See the attached three sensors (two already installed, I found the third one later and went "d'oh!"). Can anyone identify which one I can disregard (the TCS switch)?

Thanks! I'd rather sort this out now than later when I have the engine full of coolant.