Hi I'm trying to update an Airstream Basecamp with the BMV-712. The existing system has a victron display connected via ve.direct cable from the non-Bluetooth SmartSolar 150/35 MPPT. The BMV-712 display has a ve.direct plug, but the shunt only has an rj12. I don't want to have to rewire the system to use the same space as the existing display. Can I just splice the end of the ve.direct cable to a rj12 plug or does it use more than 4 pins? Is there an adaptor? Should I just give up and return the BMV-712 and go with a smartshunt and a dead display?