I'm trying to install a Google Nest doorbell. I opened up the doorbell chime, and it looks nothing like the diagrams I've found online. I have no clue how to install the chime connector, which is supposed to be the first step of installation.
Currently there is a working front and back doorbell.
Please see the diagram below:
There are 6 wires total: 3 white, 3 black. There are 4 screws, labeled 0, 1, 2, and T. The 3 white wires are all going to 0.
Any help would be appreciated in knowing how to install this, or just knowing what the screw numbers mean. Thanks!