You may find this interesting....
After I posted the video where I was controlling the G37 gauges via the CAN bus, Daniel from SU2 Performance in Olsztynek, Poland asked for some CAN bus reverse engineering help for his TWIN TURBO 370 with the ZF8HP!!!
He sent me some CAN bus logs and in a few hours he had what he needed.
Here is a video showing the car from their youtube channel, but is isn't in English:
Here is a pic from under the car:
phunk is correct... that is the best transmission for the 370z!