Hi , I had the same original sensor GWS10 , which is no longer available from Garmin had the replacement is the Garmin Gwind kit which I fitted, the kit came with a new 30m cable to run down the mast which was made off with the correct plug to plug into the new sensor, the trailing end you have to cut to length to make off at the new interface conversion box GND10 which must be used, the kit also comes with a NEMA2000 cable that would connect into the network back bone from the GND10 box but I cut and made off the trailing end of this cable and joined onto the existing mast cable which I cut to length and fitted all neatly in the void space at the bottom of the mast above the headlining and nothing can be seen, when I powered up my instruments Garmin GMI 20 it immediately recognized the Gwind with various calibration set ups which I just left as factory default and all works perfectly, the existing NEMA2000 mast drop cable from memory is 5 core and the new Gwind is 4 core , the GND10 interface box conbverts this 4 core signal to talk to the NEMA2000 network, regards David
