So finally the computer with my Prepar3D installation was moved in to the cockpit and all the wires attached.
About an hour later the controls was configured in FSUIPC and the old lady was ready for a flight.
Smooth! And frames around the locked 30 FPS at all times.
So far I am very satisfied with P3D.
Picture below if west of Copenhagen in snowy conditions. 
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Witch licence did you buy for prepar3d?