The Nest Temperature Sensor is only compatible with the Google Nest Thermostat E and Google Nest Learning Thermostat, not the newer Nest Thermostat. To my knowledge, there isn't a sensor you can use with Nest Thermostat unfortunately.
Chiming in to see how I could help.
Thanks for sharing how it works, @davidking.
@SAZaragoza, I hope you've got the answer you're looking for. We're looking forward to bringing more features with the Nest thermostat. In line with this, I'd like to encourage you to use the Google Home App's feature to share feedback via voice command or manually. Also, have a look at this article for the Nest Temperature Sensor and let us know if you need more help.