Don't wire the Garmin harness directly into your -12. Use a pair of DB9 connectors. That way, should the harness ever fail or Garmin come out with a different GPS that you want to install, making the change will be very easy to do.
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Wired in direct with a switch.
Thought about moving the ELT and intercom, but not necessary The factory hardwire cord has an odd ground wire but it works. Went straight to the battery with a 1.5 inline fuse as recommended by the manufacturer. Used an LED lit switch. Added the external GPS antenna too. Going to try it next to the dynon under the cowl. Will report how that works. Did need to fabricate the gizmo mount with L channel behind the panel. Pretty easy.
Will this interface with the Dynon ADS-B? Does it come with GPS antenna or what did you use?