I am turning my 08 250r into a streetfighter, and I was wondering what is a good speedometer to use. I see when looking on line, some mechanical ones have ratios. What is the ratio of the stock one? Just looking for a speedometer/odometer/trip odometer. Don't necessarily care about having tach/fuel gage and indicator lights. Thanks.
I don't know the ratio. You could mount your stock speedo in a can (piece of PVC pipe or a metal or plastic coffee mug)
I am partial to Trail Tech's Vapor speedo/tach, which runs off a magnet attached to the brake disk, so it's adjustable and very accurate. Also, you can get a surround for it that holds the stock indicator lights very nicely. It weighs practically nothing and provides a lot of useful info. It's about $120, plus $50 for the "dashboard."
Here it is on my '06:
They also make a smaller, less expensive unit, with no tach, called the Endurance II, but it has no provision for the lights.