You finally plugged your unit into the OBD II, and turned on your car, but the numbers are blurred and doubled. Before you send your unit back as being faulty, you might first want to take a look at your windshield. Not all windshields are created equal, and some glass panels will double reflections. The good news here is that there is a really simple way to remedy this problem- reflective tape. Many designs that we have seen on the market actually come with reflective tape or a reflective panel to mount to the glass. This will allow the users to see the reflection clearly. Even if you aren’t seeing double with your device, these reflection panels help users see the display more clearly, and may prevent annoying glare on a very sunny day.