Advanced electronic circuitry and precision air core meter provide fast response and smooth movement under the most demanding conditions. Air core eliminates drive against bi-metal by utilizing magnetic fields for resistance free and exact operation. The rubber lined shock strap absorbs the rough pounding and vibration commonly found in sportsman racing. Includes playback for post-run analysis. Operates on 4, 6, and 8 cylinder engines with standard electronic and most high perf. racing ignitions with 12V power.