Hi Hardy......
Use of the PSS Bus is not officially allowed however........................
There is a Panel Merge which allows you to use the Panel and Dynamics from the PSS bus on our very own IFDG model. (As the PSS A320 is so old, the IFDG exterior model is much better anyway, so to be honest, this is the best way to fly the PSS Airbus series)
The Panel Merge details can be found on Avsims File library by searching for the file "pss_ifdg_panel_merge.zip"
That file has all the relevant instructions. You will get an engine overtemp warning with it which can be corrected by following the instructions on
THIS FORUMHope this info helps, sorry it is not any easier!