Diagbox gauge errors

[tmvk-]

When I take "full diagnosis" with lexia, it gives to gauges section: "wrong value (to speed,rpm,temperature,etc) monentary fault".
Any suggestion, what causes this?
When I delete them, disappears for couple days, and comes to list again.
I have checked electric connectors and fuses.
Gauges are working anyway 100% fine.

C5/2.0/2001

- - - Mis à jour - - -

I have also updated BSI and motor ecu from old lexia cds.

[tmvk-]

Rpm

I have changed before dead rpm-meter, now as new.

[tmvk-]

Brightness

Some same year C models I have seen, had backround brightness adjustment. My car has only blackpanel mode.
Can this be changed?