My buddy has one on his Ego V V2, and hes pushing about 4.2 volts, not sure what ohm the coil is though. I like the looks of the tank, and i really wanna try it out haha.
Being dual coils they need a little more power. For a 1.8 ohm single coil I'd roughly set it to 3.6/3.7 volts, a dual coil could be really happy with 5 volts, provided it wicks correctly. If you feel burnt taste turn it down.