Using the AS SIDB Y cable and an additional 2d xducer ...

*SI/DI/Temp will come from the SI xducer ...
*2d will come from the additional 2d xducer ...

The only advantage with the XP 9 20 T is that the XP 9 20 T can be used by itself for 2d and Temp if the SI xducer goes out ...(plugging the XP 9 20 T into the head unit without the AS SIDB Y cable) ...

Rickie