Traducer cable mating with HDR 650

[ap.thoms]

Hello,
I bought a boat which already had a depth sounder thru hull and with a depth sounder and a cable coming out of it. Sadly no face to it to actually read the depth.
Sadly when I left Canada, the only depth sounder I could find was a hummingbird HDR 650. My boat does not have a transome which is in the water and able to mount the depth sounder there. Also being a small boat not good spot to fiberglass in the depth sounder easier.
Now in Mexico heading across the south Pacific I was hoping to set this up, and thought maybe I mate the HDR 650 with the cable coming out of the thru hull.
The cable coming out of the thru hull has the label on it "airmar transducer cable #c144...c1225" and was wondering if anyone had any idea if this was even possible, and if so which cables connect.

Thanks,
andrew