I have both 5-in-1 and a 3-in-1 sensors and meteobridge.
If you select a 3-in-1 as your primary wind sensor in meteobridge, your reported wind direction will default to zero degrees North. Wind speed and direction are not separate. So unfortunatly, you couldn't use a 3-in-1 for wind speed and a 5-in-1 for wind direction in meteobridge.
That's good to know. Hopefully they come out with a series of sensors someday that can be installed in proper locations.
