Main PCM ground?

[ShootyMCstabby]

Starting to wire in a quick 6 ( transmission controller ) and it asks to splice into the main ground as close to the ecu as possible. I see 5 grounds total according to the pinout diagram.

Pin 25# Black, is grounded a couple inches away from pcm to frame.
Pin 76# & 77#, BL/WH.
Pin 51#, BL/WH.
Pin 103#, BL/WH.

So I guess my question is which would be the best to tap into?
Thanks.

 

[2000GTSTANG]

I would tap into the ground thats next to the PCM. Those other PCM grounds are up near the battery.