i was doing a search for a way to keep an eye on the knock sensor. i came up with this http://aeroforcetech.com/. it can read and clear codes, but will fit into a 2 1/16 gauge pod. also will read out on the face 2 different parameters (user defined) in real time. including knock and real timing. i know alot of us running f/i carry code readers/ clearers with us. would be nice to have one permanent and nice looking.
problem is, they only have them for chevy right now. i have been bugging them to make it for the Z, and they said it was about 2-3 months out. they said they may also need to test on someones car. they are in the cleveland ohio area.
the more people that bug them the faster this will be available. price for chevy is $220, hoping the nissan version will be about the same.