The KLN 90B requires ARINC (via the HS34), per http://wiki.dynonavionics.com/GPS_Serial_Compatibility_and_Configuration_Settings and also this thread that pertains to SkyView : http://dynonavionics.com/cgi-bin/yabb2/YaBB.pl?num=1368848343/0#0
The KLN 94B is likely to have the same compatibility, but can't promise that.