We are interested in line 0210, it comes in 2 types: XX XX 19 00 or XX XX 11 00(FF), each is activated differently.
In the original AMG, line 0210 contains the code XX XX FF FF, but this does not work on normal dashboards; there are some glitches, and sometimes the tachometer does not work.
In order for everything to work correctly, you need to:
For instruments with line XX XX 19 00 you need to change

XX XX 39 00 AMG menu
XX XX 39 01 AMG menu + oil temperature
XX XX 39 03 AMG menu + oil temperature + battery voltage

For instruments with line XX XX 11 00(FF) you need to change

XX XX 31 FF AMG menu + oil temperature + battery voltage



For W211/W219:

1.On offset 0210: "XX XX 19 00" must change to
     A. "XX XX 39 00" for just AMG menu
     B. "XX XX 39 01" for AMG menu + Oil temperature
     C. "XX XX 39 03" for AMG menu + Oil temperature + Battery voltage
	 D. "XX XX F9 03" for AMG menu + Oil temperature + Battery voltage

2.On offset 0210: "XX XX 11 00" must change to
     A. "XX XX 31 FF" for AMG menu + Oil temperature + Battery voltage

3.The original AMG IC have code “XX XX FF FF” on offset 0210 (Full AMG options)

Read more:  https://www.smartland.am/forum/other-m/topic-281.html