Raymarine (Autohelm) ST50+ Wind Manual:
http://www.raymarine.com/SubmittedFi..._plus_Wind.pdf
Hopefully, the wires inside the Wind
Transducer will be colour coded Red, Yellow & Bare (screen), which will allow a simple colour to colour connection.
Raymarine Telephone help line (USA):
1 800 539 5539, extension 2444
or
1 603 881 5200, extension 2444