The word "readout" refers to the display or output of information from a computer, device, or instrument. It shows you what is happening or provides important data. Full definition
The lower section of the central display is used for displaying icons that provide information about the status of the driver assistance systems as well as digital readouts of the outside temperature, transmission gear and transmission mode (if an automatic transmission is fitted). (topspeed.com)
I wish there was a digital readout of the vehicle's speed that was always visible. (truecar.com)
However, switching the drive mode to Sport changed the display radically, with digital readouts for both vehicle and engine speed. (cnet.com)