Nest power connector wiring help !!

[Steelers6891]

Hey Everyone, I just set up my Nest Thermostat with only two wires (W,R). I purchased the Nest power connector but i am having trouble figuring out the wiring on my boiler. I’ve located the thermostat wires but they are pigtailed into a connector (attached photos). I could tap the power connector to them but I’m not sure where the rest of the wires go. 

I see these connections but they are only labeled 1,2,3 not C, R , Y

 

 

[Ryan_G]

Hey folks,

Thanks for visiting the Google Nest Community. 

Since this thread hasn't had activity in a while, we're going to close it to keep content fresh.

If you have additional questions, feel free to submit another post and provide as many details as possible so that others can lend a hand. 

Hope this helps!

Kind regards,

Ryan