Finished wiring up the breaker panel, continued to tidy up the wire bundles.

Reviewed G3X system diagrams to make sure I understood wiring logic.

I spend about an hour online searching for detailed info on the GAD27. Tons of overview level materials, but not much detail on what options I had for the discrete inputs. I finally gave up and called my avionics guru. The answer is that they can be activated by pulling either to ground or power.

I asked the question because I was trying to determine how to have a CAS message for pitot heat on when the switch was activated. I was really overthinking it with the idea that I had to have a DPDT switch to power one side then pull the other side to ground at the same time for the indication. Turns out the only thing I really need is a simple SPST switch and power both the pitot heater and the CAS off the same terminal.

The pitot takes a 20 amp breaker per Garmin, so for the tiny wire to the GAD, I'll need either an inline fuse or just a fusable link. TBD.