You can do that. The wire colors are as follows: Blue = HF+ and Black = HF-. If connecting temperature wires to external temp port, White is temp+ and brown is temp -. The HF tap should be set to A.
Please note that the FCV295 is not a chirp fish finder, so you'll need to select a frequency in its range of 150-250. Also, the frequencies from 171-183 cannot be used due to noise (aka Chirp Frequency Lockout).