How do psychoframes work?
From: http://gundam.wikia.com/wiki/Psycoframe


  The Psycoframe is a technology that builds on the brainwave-to-machine code translator known  as Psycommu into the atom-level of the metal frame of a Mobile Suit. This allows a Newtype 
  pilot to control the mobile suit as if it were his/her own body with limitations.


Although not very obvious it seems that Psycoframes allow Newtype pilots to have something like a mental connection to their Mobile Suits allowing them to control them as if they were a part of their body.