Thanks again Beenthere. One last question. This particular sensor in the install manual it says "Wires must have a cable separate from the Thermostat cable" and it shows in a diagram that between the thermostat base the wire goes and connects to a cylinder shape thing then the wire continues to the sensor terminals then goes back to the cylinder shape thing and then back to the thermostat base. That cylinder shape thing is like a junction connection between the thermostat base and the sensor. Why is that? And is that necessary?
thats a link to the manual in pdf format. on pg 3 it says that.