I have a VDO electronic one in the Cobra that I had and to reset it all I had to do was push the button until it said automatic, drive 1 mile, stop and push the button again. I put it in back in 1997 and it is still there and working great. I even checked it and the tach with the help of the CHP and their radar at 60,70,80,and 90MPH and it was right on on both of them at all those speeds.
If the new one does the same thing check your sending wire as I had that happen once when it got loose and it would make the needle fluctuate all over. This is all depending on if you have the electronic one like I had.
Ron
