You can use the TM transducer and pull DI/SI from the transom transducer. Just make sure you have the network "OFF", other wise it will be using both transom transducers. Just run an Ethernet cable from the Touch graph to the 5 for networking capabilities.
If the 5 is a gen 2 (which I doubt it is) then they can even share map cards if you have an update past the 2.0. If your 5 is a gen1 then disregard these last 2 sentences.
Edited by grout-scout (02/25/16 08:48 PM)