Sound Shift for iRacing is software that provides audio cues for gear selection, brake force and rev limit. All can be adjusted and even muted if you don't want all cues. This service contains its own Sound Shift files for iRacing users to download and use for their installation. Especially useful when new cars enter the service.
I went with 7000 after testing in sim and finding it much faster than the
ShiftRPM
of6690
in the API data.