Help With Sensors

[KellerMAC]

I am rebuilding a 72 C10 and I have found 2 sensors that I don't know where they go. They are both the same thread pattern - I am guessing on is the oil sensor and the other is the water temperature sensor. One has a flat end where the wire goes and the other has a end with a tap on it. I found a hole on the right side of the 350 SB where I believe one goes, but I don't know which one goes there and I can't find where the other one goes. Please help.

Thanks