Emontx or emontxshield and Raspberry Pi

I would like to measure my 3 phase electricity  by using 3 clamps on an emontx of emontxshield (the easy way, with 1 AC/AC adapter)

Since i already have a Raspberry Pi running for my 1-wire network - it monitors 18 temp sensors and 4 dual counters for gas and elec usage - i would like to connect it to the Pi.

Is this possible (connection by wires,not 433 or 866MHz) and if so, what is the best choise? (the emontx or the emontxshield)

Is there a "guide" for this?