I apologize if the answer to this question is in some obvious place, but I've been searching for a couple of hours now. When did Z's start using speedometers that start at 0? I read that the late model 1971 Z switched from beginning at 20mph to 0, but I know that there are some that start at 10mph.

 

my car is a 73' and the speedo starts at 10 still.

 

Mine's a 75 260Z and mine still starts at 20. Could be a new speedo as the dash was completely redone

 

my 77 starts at 10. I don't know of any S30 that starts at 0.