OK, a few half jobs on the skyline this weekend because its booked for a test day at Wakefield Park on 27-Feb.
While the Ecutek dongle and app provide display and logging of a heap of engine parameters, they annoyingly don't have access to the auto trans temp.
So I grabbed an oil temp gauge from Raceworks which apparently has warning colour change and peak hold, about $95
and their 8mm hose sender adapter
Now, I foolishly thought these 2 might work together, but no, the sender needs about 30mm clearance in the fitting and the adapter only had about 8mm. I've cobbled something together with an NPT T piece and blank for now but will try and work out something more permanent as I intend to use the same fitting for the data logger in the future.
Under the car, Nissan's engineers decided that only one opportunity for coolant and trans fluid to mix (the radiator) was not enough, and they also added an interwarmer near the sump on the passenger side like the engine oil has:
I've cut the hose between the auto trans outlet and the interwarmer inlet and inserted the sender there as that gives the best indication of temp inside the transmission.
From there it is back to the pain of running that sender wire to the cabin, I've run it up near the passenger headlight, into the battery box, across the channel at the back and into the master cylinder area where I ran out of wire length (and patience). Remainder of the job is through the grommet near the accelerator pedal that I've used previously, then across under the dash to where I will temporarily mount it on the console for track days (and remove it other times). The gauge will also need IGN, BAT and earth (I'm not going to worry about illumination as I'll unhook it between track days)