If you're keeping your original instrument cluster, then you do not need to worry about correcting the miles. When you replace the LCD screen or do any other type of repair, your mileage will remain the same since it is actually stored within the instrument cluster. If you're replacing the instrument cluster, then you do need to have the vehicle's mileage programmed into the replacement cluster. When you purchase a refurbished instrument cluster from Tanin Auto Electronix, the odometer correction is included!