YES. Temperature probes must be extended with thermocouple wire.

Do not use copper wire. (However, tach and fuel flow wires can be extended with copper wire.)

If you add wire, be sure it is the same thermocouple wire and use zinc chloride solder such as “Nokorode” brand. Rosin core solder and Nokorode flux.

**** IT is better to use good quality Butt Splices instead. Drill out center hole bigger if necessary, so both wires will ‘mesh’ inside better.