Posted for Peter.Sokolowski@t-online.de (Peter Sokolowski):

 Hello Alain,
 I also have the KLN 89B, and as far i can remember, the unit does not produce
the ARINC output, which is required for the GPSS functionality. I will check
again, but I already discussed the subect with TruTrak and they gave me a
negative answer.
 
 Best regards
 Peter (360, 45%, rebuilding engine)