I have done the same thing (with the same pin) and unfortunately there is no safe and simple way to fix it. I carved out the broken pin and soldered a pin from a used printer cable to the wire. The new pin is narrower than the original but it works. PVC is difficult to melt which makes it hard to mount the new pin firmly.
At another forum someone suggested you get an extension cable, make a long pin to replace the broken pin and then connect the extension permanently. I'm not sure this is as simple as it sounds because there is very little space for alternative positions for the new pin as long as what's left of the broken pin is left in the transducer connector.
If you know the wiring in the transducer cable and the extension you can cut away the damaged connector, cut the extension and splice the male end to the transducer cable.
Rickard