Valeo speed visio Gebrauchsanweisung Seite 7

If the displayed speed is lower
For example, the speed displayed on your dashboard is 60,
but the speed/visio displays 57. Please enter the speed fine-
adjustment setting, then adjust the value to 159~164.
Make the adjustment while matching the speed displayed on
your dashboard.
The third setting is the speed
There are five ranges of speed: 10, 20, 30, 40, 50*
(* the default setting is 50, see Operating Manual No. 6).
If you wish to adjust the speeding value to 15, you should
enter the function mode.
Press the button three times to enter the first speed value
"10", then press the ▲ button until "15" is displayed (if you
keep pressing the ▲▼ buttons, the number will change
rapidly). By pressing the button once, you can move to the
next set of speed value adjustments.
Complete and leave the function mode
Press to leave the function. The HUD will save all the
settings when you leave the function mode. All settings will
remain valid when the power is cut off.