I have the same tach. When it rains, cover it!!! It IS NOT waterproof. Cover it at night at motels and such if you do not use a bike cover. Moisture WILL get in and when it does, the needle will rotate completely out when you turn on the ignition. Once it dries out, it will be fine. I am going to try and waterproof mine this spring. I made a nice aluminum housing for mine at work, moisture still gets in from around the bezel and the button to change light color. Trust me, cover it!