Had this on my Zed, records , displays loads of info, reads fault codes,works on other Jap cars besides Nissan's..see this website for any more details
http://www.optionimports.com/grinin.html
This is literally a plug and play item 30sec job to fit into OBD2 connector in dash
Still the have the box and printed instructions (in English)
£85 inc P&P by recorded delivery.. Paypal , cash , sovereigns accepted
records top speed , max revs, oil temp, air flow etc etc loads of stuff you dont want to know about
will require a new piece of double sided tape to reattach it to your dash though