I want to add a chirp transducer B265LM 1kw thrue hull(fairingblock) to my existing furuno system tz

Question: I want to add a chirp transducer B265LM 1kw thrue hull(fairingblock) to my existing furuno system tztouch3 /DFF3D box 165T-50/200 ss260 dff3d.could i olug the second transducer to the dff3d box to the "External PK port" or directly to the touch3(does i need 10 or 12 pin for touch 3 if this will work .?thank you