In theory on common instruments the analogue speed reading can be reprogrammed. In most cases the whole speed range is segmented into three or four parts of slopes to have a magnifier effect on lower speeds. Each edge of those slopes is defined by CAN input data and pointer rotation angle. So it's a short x/y table with four or five lines. This table can be secured by a checksum.
You may need a software which is able to dump the EEPROM content from instrument cluster, or you may retrieve memory chip itself from cluster circuit board. To increase the difficulty, EEPROM content may be scrambled, or/and secured by an over-all checksum.
As your offset is 10% you may modify the pre-programmed k-factor into an individual value which fits your needs. This is possible on some clusters. On others you're just able to select one of those pre-programmed by manufacturer, even by modifying EEPROM data.
To stop all further requests: I don't have any EEPROM data about instrument clusters, nor I do any modifications. Please find a technician with sufficient knowledge to poke around on cluster EEPROM data. Really, this job isn't that easy and sometimes even impossible.