Improve safety and upgrade you car with Head-up display. It connects to your car computer and displays on your car windows all driving data.

Here is a product from FocalPrice with the following description:

Plug and play. HUD can auto adapt to vehicle type which in line with OBDII or EUOBD(On-Board Diagnostic System)
Comprehensive display. HUD can display many parameters at the same time as follows, vehicle speed, engine speed, water tempe- rature (voltage, throttle valve position, ignition advance angle, time of 100 km acceleration), fuel consumption, mileage, low fuel tips, engine failure
Diversiform display mode. Driver can chose normal display mode, high- speed display mode and automatic display mode.
Free switch. Km and mile can be switched freely to meet the need of inch auto meter.
Suitable size. The display area is 5.5 inches which is very clear for driver to read data.
Automatic power on and off. Starting with the vehicle starting, stopping with the vehicle stopping to protect the vehicle’s battery. Moreover, we pre- serve the hand switch function to control the HUD
Flexible alarm mode. HUD can offer single-stage and four-stage overspeed alarm modes to choose to make driving safer
Engine speed alarm. It contributes to shift gear in time to save fuel also has significance to new driver
Flexible brightness adjustment. The brightness can be adjusted automatically or manually to reach the best state which is in harmony with the environment

Spec:

Goods accessoriesHost ODB data line reflection paster host fixed pad specificationDisplay typedigital Baby forAll conform to the second generation of vehicle automatic diagnosis system (OBD II) modelsProduct Size150× 85× 14 mmProduct weight278 gPacking box size7.5× 11.5× 50 cmQTY30N.W8.3 kgG.W8.9 kgEnvironment temperature
~40c+80cAtmospheric pressure86-106kpa

Alarm sound level>>=30dbWorking voltage9v~16 vdc (12vdc/70mA)Display project
Speed · engine speed · instantaneous fuel consumption · engine temperature · battery voltage
Speed display
Projection display car speed; The safest way to avoid lower the head to watch
Engine speed
Show car engine speed state
Instant oil consumption
Display the current instantaneous speed per liter of gasoline mileage drivable
Speeding tip
In the setting of overspeed alarm value, to achieve the speed flashing lights up and prompt
Battery voltage
When the battery voltage is lower than/when to 12 v, warning will light up to remind
Engine temperature
Water temperature reached 115 degrees automatically alarm and light up
Shift hintWhen the engine speed and speed reaches a certain scale,tips to save fuel consumption increase gearKm unit
The international system of units, the general use kilometers per hour, with km/h
Buzzer mark
According to the switch can be opened and closed buzzer sound

Product Link:

Product 1:

http://www.focalprice.com/ER3165B/W02_Automobile_Head_up_Display_OBD2_Speed_Alarm_Fuel_Consumption_Fault.html?utm_source=Radica&utm_medium=EM&utm_campaign=DM_1532ZM_ER3165B&sc_src=email_984289&sc_eh=03ff4510e6d7b1121&sc_llid=64648&sc_lid=31560302&sc_uid=aGT389GP99

Product 2:

http://www.focalprice.com/ER3131B/EM05_Automotive_Head_Up_Display_with_Super_Bright_Digital_Display.html?utm_source=Radica&utm_medium=EM&utm_campaign=DM_1532ZT_Year2014_ER3131B&sc_src=email_982611&sc_eh=03ff4510e6d7b1121&sc_llid=37204&sc_lid=31500223&sc_uid=aGT389GP99