Several weeks ago I bought a used 06 636. I love it. On my way to work one day I was on the highway and noticed that my speedo said I was running like 106 mph or so. However I was only moving slightly faster than the avg 70mph 18 wheelers. The bike is very torquey.it has a power commander 3 on it and I suspect but have not verified that the sprocket have been changed. I understand there are speedo healers to fix the problem. But if I can help it I do not want to spend an extra $100-200. To add ANOTHER device under a seat that I already have very little room. Question is can this somehow be calibrated through the power commander?