Meanings of digital speedometer in English

The digital speedometer reads 70, and this baby hasn't even broken a sweat.

The first, obviously, is the digital speedometer, but I don't think it displays the speed instantaneously.

Writer is mesmerized by the digital speedometer.

Now the digital speedometer reads 80.

The Crown Vic's V-8 surged; the digital speedometer blurred up to 92, where it hung.

Avocet has long been one of the leaders in the booming business of cycling computers, those digital speedometer-odometers you see sprouting from cyclists' handlebars.