I have a 998 HD SI mounted on a Basscat Cougar. Also in dash is mounted a Hum. 787 c. Is it possible to join these two to one transducer that I can use to read the bottom at speed. I know that I can install a XP 9-20 transducer and use the Y-cable (AS SIDBY) to the 988 for it to read speed and use the SI transducer for other functions. The reason I am asking about connecting the two ( 787, 988) is that my 787 transducer has stopped working. Thanks, Roger Godwin.