OK, been through a lot of videos about mapping the TRACKIR centering command onto my throttle in DCS but not getting a clear answer. 

Anyone please point me in the correct direction.

Thanks 

Beyond TrackIR's own "center" key, which defaults to F12, you can re-center in DCS by hitting Num Pad 5.

Not sure if that helped.

I mapped the TrackIR centering direct into the NatrualPoint Software. I use on my Virpil Throttle the Button 32 for centering.

Here´s a screenshot of my configuration. Hope that helps.

Thanks guys, that nailed it.