Lovely mod, but the design of brass gear icon looks a little bit out of place compared to the rest of the game.
Tried to play K2+SE+VeryBZ+If_I_Had_A_Nickel+BrassTacks and it sticks out that brass has slightly different style (more similar to Industrial Revolution icon style).

In vanilla (err... non-K2) there being only the one type of gear means changing it to a different style doesn't matter much, as there's nothing for it to clash with. But you're right that it does look a little odd alongside the Krastorio gears, and since I already have the code to use a different gear icon with K2 this is a pretty easy change.