''I bought a KLN-90 a few years ago It was a good unit and King is still selling DB's at a reasonable price (same as Garmin, I recall). Back then, decent units were going for $800,. It uses ARINC also. I believe it also had the connections for the old school CDI's as well.''
I did the same as Larry and still have my KLN-90B in my RV-4 and it is working flawlessly on every IFR approach I've done with it..The Database are current and stil available from Bendix/King.
Mine is connected to my Dynon Skyview.
I will be selling it soon to update to a G-175 to get LPV approaches capablities so let me know if interested, wiring harness and up to date database included..