The two orange wires directly go to the two 24 VAC slots of Netro. If you are in US, please make sure it is 110V input and 24V output power Adapter. The AMP should be larger than 600AM if your sprinkler system has mater valve.
You do not need to connect the rain sensors because Netro get the weather forecast through WiFi. You can check Netro Whisperer sensor and it is only available on our own website https://netrohome.com due to lack of stock.