[Nigel]

I'm assuming this thread is in the correct place as it's for a 4pro set up but since it is about sensors as opposed to the 4pro it's self I could see it being something that is of wider interest.

Edited...
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Bellow Steve identified the outer two wires (green and black on my original FO wire) as wind direction.  the inner two (yellow and red) as wind speed.  Steve has shown the correct connections as to those labelled speed and dir. respectfully.  The second wire of the sensor pair being connected to the adjacent GND.

There is no interplay between the two sensors or circuitry the anemometer simply plugs into the vain to bring the wiring together.

I could not get the anemometer to to produce a reading and have stripped the devices down to clean them and (subsequently) replace the wiring in favour of network external cabling each sensor as a twisted pair.  I guess this will support putting the wind instruments up a 10 m pole... eventually.
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I've moved wires around.  Assuming that FO sensors originally operating with two 1.5 V batteries should be on the 5 V supply.  Have assumed:
red     = +ve
black  = ground

I have:
yellow = direction
green  = not functioning

It is highly likely that the wire has broken since the anemometers last use.  The outer sheathing has split in several places.

Tipping bucket functions well:
red     = +ve
green = signal