I'm thinking about adding the King KLN-89B to my Skyhawk to give it IFR GPS capability at a low cost. Does anyone out there have one of these units also have the KX-155 NAV/COM? I'm trying to figure out what CDI will interface easiest with both and what annunciator is my best bet with a 14V system. I know there are other, newer, better choices out there, but my question specifically addresses this unit. I know it's asking a lot, but I'd like to keep opinions limited to this unit specifically. Thanks in advance!