As its name, Tesla Core Lib Mod 1.12.2/1.11.2/1.10.2 is the library that makes a big contribution to creating power hungry machines. This is a useful mod that is worth you playing in the future.
In fact, this mod is just a support lib for some technical mods. Thanks to it, the other technical mod can work effectively. That is the reason why this mod is quite complex and you need some supports from other mod for this mod can work effectively. But the reality is that unless required by the mods you wish to play or if you want to create a mod using the library, there is no actual reason to install this support library mod.