Picked up a ConZult cable from CZP (conceptzperformance.com) so I could plug the Fairlady into my laptop and get some diagnostic information. There are several programs for sale out there that offer free evaluation versions, eg: ecuTalk, ConZult, Datascan.. The problem is that the free versions are all very limited in functionality.
Enter Dr300zx (dr300zx.sourceforge.net) a free program that appears to do everything I need. Diags, tests, sensors, live data, etc. Definitely recommend it.
Here’s a couple of the screens:
403z 