Hmmm well that sucks. Well actually, you know that if you move the needle to a different angle it will show a different angle right? Lets say that you make the needle stay stationary at 20 mph by taking it off and rotating it. Well why not do the exact opposite? Put the needle UNDER the litte shelf it has at zero, fasten it, then put it above the shelf? By that way, then the speed should register about 10mph more to match the difference you spoke about. Idk. Crazy but yeah.