This probe is for 655, 301, 307, 303, 803
Works as advertised! My indicator constantly read -199, this probe resolved the issue as the other was bad.
Purchased the C307PS probe for a GTX 335. Sadly there was no reference documentation which helped identify if the Red or Black lead was Input or Output needed to connect to the GTX or even the GAD 13. I figured I would share that through trial and error, it was identified that the Black wire from the probe is the Input and the Red wire is the Output. Also, given the recent announcement for the G5 software update which allows displaying outside air temperature (OAT) and true airspeed (TAS), it appears that the GTX 335 does not share this data with other devices or at least it does not appear possible at the moment.
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Per the manual the model that they recommend for installation is C307PS which is our p/n: 11-04603. Per the note it is requesting thermocouple wire equivalent to what C307PS has.
This probe does not have certification on its own. It typically is included in the certification of the instrument you want to use.