There are 2 “Y” cables available from Humminbird ...
1. Splits off the 2d crystal such that SI/DI/Temp comes from the stock xducer and 2d comes from a separate 2d xducer ...
https://humminbird.johnsonoutdoors.c...splitter-cable
2. Splits off the left SI crystal such that 2d/DI/right SI/Temp comes from the stock xducer and left SI comes from a separate SI xducer ...
https://humminbird.johnsonoutdoors.c...splitter-cable
There is no switch available to use 2 xducers on 1 head unit ...
Rickie