I found the FSM for the G37, no reason why it shouldn't work. The electromagnetic unit has a linear relationship between current flow and torque. Reuse the factory skyline wiring, trick ecu into think everything is there. Drive the EM ets actuator via a solid state relay that can handle higher current if the hydro ecu can't handle 5amps (or possibly a bit more). Factory G37 logic is cut the 4wd when the transfer case fluid gets over 80deg C. You could easily make use of the hydro ets reservoir low oil switch to warn you via the 4WD light that the oil is hot. Then make the EM ets actuator fit in a gtr transfer case, thats the unkown. Doable like anything, very tempting...