Not tested sell as is The Engine IGNITION ANALYZER Vintage RAC Maxi-Tune Dwell VOLT POINTS RPM 4 - 8 CYL is a diagnostic tool designed for analyzing engine ignition timing in vintage vehicles with 4 to 8 cylinders. Produced by MAXI-TUNE, this engine analyzer allows users to measure dwell angle, spark timing, and RPM to ensure optimal engine performance. With its retro design and specific manufacturer part number RPM 4 - 8 CYL, this tool is a valuable asset for automotive enthusiasts looking to fine-tune and diagnose their classic engines.