Hi There
The standard speedometer limit is set to 299km/h, so if you've configured it with the GS-911, the other option would be a 399km/h limit. If you've changed the limit with another tool, I'd suggest using the GS-911 to do it fully.
The configuration hereof is listed under the instrument cluster > coding configuration. Once here, you'll be able to alter the display limit.
Kind regards and safe travels
Ruan