I purchased the "Xtension" limit switches to connect to the black box. However, I accidentally ordered 2 conductor wire instead of 3 conductor wire for them. Any reason I couldn't just wire the Xtention switches like micro switch per the instructions or is there something special about the Xtention switches that I should just order 3 conductor wire? 2nd, I purchased non open build stepper motors. Will it matter which coil pair I connect to the "a" pair or "b" pair on the black box? Thank you for any input.