Head-up displays for cars
Head-up displays for cars show your speed and other driving data in your line of sight, so you don’t need to look down at the dials. You’ll find models for the OBD2 diagnostic port, GPS speedometers for any car, combined versions and projectors for the windscreen.
Head-up displays for cars
Models for the OBD2 port read data from the engine control unit: speed, revs, coolant temperature, battery voltage or instant fuel consumption. Some also show boost pressure or fault codes. In the EU, petrol cars have had an OBD2 port since 2001 and diesels since 2004, usually under the dashboard on the driver’s side.
GPS speedometers measure speed by satellite and work in any car, powered by USB or the cigarette lighter. As well as speed, they show the time and a compass and warn you when you exceed a set speed. The GPS reading is often a few km/h lower than the speedometer, which reads slightly high from the factory. Projection models reflect the data onto the windscreen, and a reflective film reduces double images.
Position the display so it doesn’t block your view and isn’t in an airbag deployment zone. Set display modes and warning limits before you set off. If the OBD2 port stays live after the engine is switched off, unplug the display during longer stops so it doesn’t drain the battery.
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