Getting MSFS variables for Piper Arrow III

  • I have just got Behringer x-touch Mini Midi controller and I am trying to set it up for the PA28 in MSFS using "Axis and Oh's"

    Standard Events and Variables Like Pitot switch, bug heading etc I can find.

    But there are some I can't find that . I have spent hours trying to find the variable that gives me the "State" of the fuel selector so i can turn on/off lights on the X-touch accordingly

    Is there some documentation or website relating to this aircraft which might help me ?