My 1990 Maxima has this problem where about 60%-75% of the time the speedometer will spike all the way to the max reading. The needle won’t come back down until the car is COMPLETLEY stopped. After you begin to move again the needle will sometimes go up and down up and down until it reaches the max reading. It will do this at the speed that the car travels right after you let loose of the brake pedal but after you gain speed past about 3mph the needle is at max. It is like it will go through spouts of extra sensitivity. I was wondering if anyone has even heard of a car doing this. The odometer also goes out every once in a while but not very often. Any help would be great! thanks

 

Replace the speedometer cable. This should solve your problem.

 

My tachometer went crazy awhile back, replace the little motor on the instrument cluster from a junk yard and it worked fine