Does anyone know of these sensors are soldered to
the wires inside?


Assuming it's the 7859 temp/hum sensor you're asking about:

http://www.davisnet.com/product_docu...sensor_std.pdf

This is all the information that's readily available and doesn't for
example show the pinouts on the connector. But it may help?

John Dann
www.weatherstations.co.uk