Do you want to purchase lcd speedometer? We have lcd speedometer for sale.
So why not just take that space devoted to the gauge and smack a big digital readout of current speed in its place? Because it would suck. The movement of the needle around the gauge delivers a lot more information than first meets the eye. The speed of the needle indicates how rapidly the car is accelerating or decelerating. Imagine merging onto a highway. On the entrance ramp, you glance down and mentally note the movement of the needle as you begin accelerating. You return your eyes and lift off the gas when you think you’ve roughly reached the appropriate speed. Your intuitive sense of that target speed was informed by the prior glance at the movement of the speedo. Having the full range of speeds displayed at all times allows you to establish zones on the speedo. Once you’ve learned the speed ranges of your particular car, you can glance at the cluster and get a quick approximation of your speed without having to read any of the characters on the panel. Usually, this rough awareness of speed is all that you need. Am I going slow, moderate, fast, or super fast? Additionally, there are other “events” that occur at various points in the speed range. Many Porsche models have spoilers that deploy between 50mph and 75mph. European cars are sold with speed governors that cut engine power at 155mph. You can pay extra when you buy a BMW or Mercedes to have that governor deactivated. The latest high-powered Corvette has exhaust valves that open above 3,500 rpm for better performance. It’s nice to be able to gauge where you are relative to these events. Here’s a use case where seeing the position of the needle within the full range of values is critical: Shifting gears with manual transmissions, which much of the world still does. Coordinating the position of the two main needles (the tach and the speedo) is essential both for properly timed upshifts and smooth downshifts (“rev matching”). Each gear has a common range of RPM that correspond to a different range of speeds. My car has five gears, and each of those gears can drive the wheels between a given range of speeds. If you use a gear below it’s corresponding range, the engine may stall; if go above the range, you’ll redline the engine and risk damage.