Speedometer problem
 

I'm having the same problem - when it gets below 20 degrees the speedometer gauge arrow dropes below 0 and won't work until the car gets warm. I've been to the shop twice. Any ideas of what the problem is, so I can help the dealership fix it.

I can't stress this topic enough: http://www.the370z.com/nissan-370z-g...m-problem.html

You need to get the combination meter swapped! ;)

Wow, I actually thought it was weird that mine is never below 0 lol. Guess all is well