The conventional mechanical instruments have a lot of weakness, such as they cover immovable space, the display accuracy is low, they are unreadable, they have bad augmentability and efficiency.

• 传统仪表采用机械式仪表，这种传统仪表装置在车辆中占用了固定的空间、显示精度低、可读性差、不易扩展，而且效率十分低下。