[kota2240]

Has anyone had a problem where their speedometer rises at idle when reving the motor, then it stops once the idle is back down. The problem with this is when the car is warming up the tach is around 2k or so and the speedo is reading like 50mph and the mileage moves too??? For my S13

I searched and two guys had the same problem but they havent made a post since 2002 without any solutions