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Wind speed is supposed to be indicated, period. If you are getting no wind speed reading, then you have either a defective wind vane, or a connection problem.
To address the connection problem (if there is one) trace the line from the ST60, looking for cuts, strains, breaks, etc. along its entire length, then disconnect the connectors on that line from the ST60 to the wind vane, one by one, brushing off each side of the connection with a clean dry stiff brush, and wipe the connection down with a clean dry rag cloth, then re-connect firmly, and on to the next conector (if there is more than one) and treat any other connectors on the line similarly.