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Per the supplier: No, this is not TSO'd.
Yes, per the manufacturer the Molex connectors are included in the box.
The easiest way to describe how this unit works is to say if your Garmin is 14v and the aircraft is 28v it will work, but it cannot make a 28v Garmin work on a 14v system. You would need a step up converter to do that. It is stepping the system voltage down to 14v to match the unit voltage.