Anything that relates to a driving experience is symbolic of how you are moving through your life.
The speedometer is your mechanism for managing the speed with which you are moving in order to allow you some measure of control.
A broken speedometer indicates a loss of your ability to regulate some aspect of how something is unfolding.
[1]Dreams of a speedometer signify that you are becoming aware of your progress in life and the rate of speed in which you are going. Perhaps you are getting a reality check to make sure you are not getting ahead of yourself and that you are within your limits.
[2]Your speed of travel: too fast or too slow? Look at numbers on dial.
See Also: Numbers.
[3]