The KI 206 not driven by the (PMS) GTN 650.
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This might be a known issue or a PMS vs. TDS thing - or a me doing something wrong thing :) But my PMS GTN 750/650 Pro does not drive the KI 206. Works fine with the GNS 430 though.
From the manual: "The KI 206 includes both lateral and vertical guidance needles, which can be driven from a VOR/ILS receiver, the GNS 430W, or the GTN 650."