Where do I find pin 2 on the TBS?

 

While I know nothing specific, I have found that the black connectors often have very tiny black raised pin numbers. (yes black on black).
Because I have poor eyesight I usually take a photo with my phone as close as possible until it can no longer focus and the flash enabled. Then by enlarging the photo I am able to make out the little pin numbers! Great with fuse numbers etc. Hope it helps....