I had to make a workshop cable (for testing a Logic Wind bought in 1997) to connect the masthead unit to the instrument. For your info below pin-out info for the masthead connector. The pin numbers are visible next to the pins, with some difficulty...
The connector has 7 pins but the central one is not connected. Cable colors are the same between the actual masthead sensor and its connector and the cable between the top of the mast and the instrument.
As I could not find a connector matching the one on the masthead unit I split a 6 pole female PCI connector from a computer power system into 6 individual connectors.