Temp Sensor Question(s)

[Starwood]

Finishing off my 350 Crate swap and noticed the sensor on my intake is damaged and needed replacement. I currently have what appears to be two temp sensors. The first pic is of the Driver’s side block sensor and that gives me a reading on my dash. No prob there.
The second pic is of the sensor that needs replacing on the intake. This activates the electric fan.

My question is: There is only one wire currently attached and the replacement unit comes with two wires (3rd pic).

There were no instructuons and I couldnt get a clear answer on the interweb haha.

I know this: Keeping my engine at a safe temp is one of the most important things for my Classic.

If anyone might have some guidance on which wire to use or any other options to consider, I thank you in advance for your take.

Note: The fan switches are mounted right next to radiator behind the overflow and the Truck does have AC - if this changes anything.

Thx again Fellas