Autometer Stack Professional Action Replay 80mm 0-3-8.5K RPM Tachometer - Black - ST400-0385

The original and still the best genuinely professional tachometer. This race-proven and award winning design guarantees exceptional accuracy and robustness over many years of use. Stack Professional Tachometers feature RPM recording and on-dial playback, providing up to 25 minutes of RPM history.
Installation Instructions