When combining different materials in parallel, the Wire Wizard sometimes failed to fetch the temperature data for the materials of the individual strands correctly, resulting in an inaccurate TCR/TFR output.
Now you can add your own custom wire materials, batteries or mods to Steam Engine.
What exactly does TC precision entail? Is a higher value more desirable, or lower? The TC precision number in the Wire Wizard is an attempt to describe how easily a mod can sense the temperature of a coil. A higher number means that you should have more precise temperature control.