Gnome, Goblin and Mechagnome hunters automatically know how to tame Mechanicals. Hunters of other races must acquire the skill from a Mecha-Bond Imprint Matrix, crafted by Engineers who have at least 1 skill point in Legion Engineering.
Location & Notes:
Located in Exile's Reach. If you're a gnome this beast can be found on the ship during the intro to Exile's Reach. It's friendly at this stage, but can be tamed at a much later stage, during the quest The Art of Taming.