I found it easily with ď how to splice airmar transducer cableĒ.
This is the junction box I used.
Junction Box Kit
for Replacement Speed/Temperature Insert Models: B44V, B66VL, B744V, B744VC, B744VL, B744VLC
This may or may not fit yours but it is a start.
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.