You will need a Blatz cable and Nissan Data Scan
blaZt - Nissan Datascan version 1.52 software for reading engine sensors and trouble codes.
Now after all that, Calum Real Time ecu doesn't seem so expensive...
Basic: $100
Consult Cable and NDS - $136
Moats Chip Burner - $80
Chips - Not sure how much but fairly cheap
Tuning - Painful and can't test results right of way
Total = $316
Real Time ECU - $370
NDS - $40
Tuning - A breeze, update a tune while driving!
Data Logging - Easy does it, can be free if you live with ECU Talk
Total = $410
For $100 more you save time and headaches