This harness powers up Fred's version of the XY Monitor kit from the Atari Harness power.  
 
This is the harness you need if you are replacing an Amplifone or Wg6100 in an Atari cabinet and connects into the existing cabinet harness.
 
If you have my version of the kit, this harness is already included.
 
Note: This harness will not power up the Raspberry Pi or DVG.