I barely got my car back from the paint shop and ever since I took it for a test drive after the speedometer would go crazy on me for a long time. So I thought it was going to stay like that but no. Only when I start the car it doesnt do it but like half an hour later it does it. Every time i shift it even goes more crazier jumping up and down from 60 to 120. Can somebody tell me what is wrong please. Sorry for the way of explaining the problem... thanks for any info.