I just set up the Irritrol on the Gen 2. Some suggestions:
Support pics still show Gen 1 connections. This should be updated to include Gen2.
Wires on Irritrol are very flimsy. The pressure connections on the Rachio were too stiff to let them connect. I ended up using some solid core wires as splices with wire nuts to the Irritrol's small braided copper wires.
When using a Chrome web browser, I could not get the rain sensor changes to remain. I would select the sensor type as 'Rain' but the setting would never remain. It was not until I used the Android app to select the sensor as 'Rain' and On/Enable that the setting remained.