If you should experience fogging on the inside of the fancy LCD gauge assembly found on recent Yamaha models, do not replace the entire gauge! This is usually caused by moisture (steam) entering the gauge and condensing on the inner lens.
To remedy this, inspect the rubber sealing boot on the backside of the gauge that covers the multi-pin connector where it plugs into the back of the gauge. Make sure this rubber boot is positioned properly and sealing tightly against the back of the gauge. Once positioned properly, you can secure the boot to the cable with some black electrical tape (Scotch Super 33 or 88 works best).
The gauge can be disassembled, but let the moisture dissipate on its own; do not attempt to clean the lens. Occasionally, moisture will leave a permanent mark on the lens, in which case you can now order the lens as a service part (#8EK-8353E-00-00). There is no need to replace the entire gauge assembly!