Getting ready to install 2 Garmin ECHOMAP UHD 72SV on my RXT & RXTX, purchased the GT15M-IH Transducer and found it has a 8 pin connector but the 72sv has 12 pin input. seadoo website says the GT15M-IH Transducer works with the 62 & 72sv. has anyone ran into this? do I need to purchase a adapter from 8 pin to 12? or did I purchase the wrong transducer/