I have a 2006 street glide and the speedometer started acting irratic last season. what it initially did was the speedometer kept increasing higher and higher as i was slowing down on the expressway. Finally it bottomed out all the way down. Now when i cycle the ignition, the needle sometimes cycles back but usually sticks somwhere on the speedo. It occasionally bounces around while riding, but never tracks speed. I am stumpped because the mileage still tracks as it did before and the auto signals still work properly, just no speedo. I also have a fuelmoto tuner, could something have gone wrong with that and causing my speedo to act irratic?? I also check the for codes, but no codes found. I greatly appreciate any and all imput on this.

thanks