@niklasg
If you already have EW devices, then i don't believe that they will pair with the ambient weather display. But if you don't already have a full weather station, then AW is a good option that is usually in stock on Amazon or their own website. And 99% of the AW devices pair with the ecowitt gateway.
In my use case i had the full ws5000 array before going with hubitat, so all i had to do was buy the gw1000 to get my sensors ported over to hubitat, and the WS5000 display continues to read my original sensor data while the gw1000 also picks up the same data to put on my dashboards