What it does
Uses the tachometer as a visual knock alert: the needle moves to the 8,000-RPM display position while the alert condition is active, then returns to showing RPM. That is a display override, not a command to rev the engine to 8,000 RPM.
Select the correct file
tachknock is the original VB attachment by dbzx6r. tach knock VA is hatekarma's separately shared, explicitly untested VA adaptation. They are model variants, not a newer universal replacement. A later commenter offered to test the VA version but no completed validation report appears in the reviewed thread.
Important limitation
Actual RPM is hidden while the alert is displayed. This indicator does not diagnose a knock event or replace datalogging. The discussion contains differing trigger-value examples; inspect the actual feature and signal convention rather than copying a comment's threshold into another tune. Verify your ROM's display mapping and compatibility with any other tachometer override.
Credits and original discussion
Original author/contributors: dbzx6r; VA adaptation by hatekarma.
https://discord.com/channels/1147002774505136228/1537590992188997644
Imported and summarized by the community site administration from the release discussion reviewed September 14, 2026. This is not a post made here by the original author. Attached files preserve the downloaded bytes; applicability must be checked against your hardware, ROM, and other enabled features.