2 zone older boiler for heat only system

[Joelm0812]

I have a two zone system and i want to hook up smart thermostat for my lower level. Im hoping someone here may be able to help with wiring. The pictures show what i have now. I also have a honeywell c-wire adapter. Any help is greatly appreciated. 
  pictures here. Boiler wiring:
https://www.icloud.com/sharedalbum/#B105oqs3qSVqsu

[Jenelyn_O]

Hi Joelm0812,

Thanks for posting in the Google Nest Community forum. I'm sorry for the delay. A few questions: what type of Nest Thermostat do you have? (If you already have one). Also, in what country are you located? 

Best,

Jenelyn