First, be sure that the transducers would be compatible with your system, by looking up and comparing all the specs (eg frequency of the depth
Then, obviously, you need a plug to fit your display. I assume you're re-using the plug and cord from a failed transducer - after testing it
to confirm that it wasn't the plug that failed!
Then you need to get the wiring
diagrams for the transducer and display so that you know what goes where. It doesn't always work out just matching the colours.
With all this done, you can proceed to make the connection. Careful solder + shrink-wrap, small crimp connections, or a terminal strip will all work.