there are currently two transmission swaps, one available and one not. The T56 swap is available but VERY rare, the 370z/350z 6spd is unavailable at the moment.

this is more of a tuning question if anything. most of the people on those forums don't have that experience. I've searched.

I think I may end up going with the Rear ABS signal to a Dakota Digital to the cluster.

You need to download the 370z manual, there will be a MT.PDF there you can find all the locations of various sensors like, speed, reverse, gear and others.

Me and my friend are building a 1JZ sc300, we had to use AMS ECU and there we connected z34 6speed manual, we ran wires for speed sensor, reverse light sensor and cluch switch, as i remember from the top of my head.