The KLN-94 is a direct replacement for the KLN-89B with no wiring or mounting changes needed. The KLN-94 uses a different database as well.

The KLN-94 has internal annunciators. Remote annunciators are only required if the KLN-94 (and its internal annunciators) are not in the pilot's field of view per the Flight Manual. If the existing KLN-89B was Approach certified, then the existing annunciators from that installation can be utilized.

Some setup and configuration is required when the KLN-89B is replaced with the KLN-94. This is all contained in the KLN-94 installation manual. In addition, the installer of the KLN-94 should verify that all other details related to IFR certification were complied with during the installation of the KLN-89B.

Lastly, a KLN-94 flight manual supplement must be created, FAA approved, and inserted in the pilot's operating handbook.