Speedo is determined by the output shaft sensors on the diff cover; so regardless or 3.36,3.90,4.36 speedometer will be accurate as long as your rear tires are near 27”.
As far as the cruise- mine worked great unless I stabbed the throttle & elevated it up above an un-recognized speed by eco for cruise...as before it peaked at around 90/3000.
Was going to see if tuner could recalibrate ecu to learn it/ but didn’t get that far before accident.
The 15’ & up Nismo Tech’s come with 3.69 gearing on their 7A/T’s; while the manuals get 3.92’s
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