Here is a quick way to connect the mc-80 kenwood mic to the 706mk2g 
you must get the Icom molex to 8 pin adaptor first to make it easier. 
  - pin 1 white / mic audio
  
 - pin 2 green / 8v+
  
 - pin 3 none
  
 - pin 4 none
  
 - pin 5 black / ptt
  
 - pin 6 and 7  shield and red / must conect together. Those are mic and ptt ground.
  
 - pin 8 none
  
I wired my mc-80 this way and it sounds great on the 706. 
If anyone cares to try to connect the up and down buttons please e-mail me on how you did it. 73 
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