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The King HSI and autopilot are good units, I’d keep if they are working fine for you. They are most likely running off the 530W. The 9900BX is pretty old tech and ADS-B can do nearly everything it can, except look for non ADS-B transponders, of which there shouldn’t be many left flying in a year anyways. The Garmin GTX 345 will get you both ADS-B out and in, and it interfaces very nicely with GTN and GNS units, and the Avidyne IFD. Pretty slick to see traffic and weather in the panel of a 172, and even better in a serious IFR Skymaster.
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