The Vintage Dixson Inc Tach Dwell RPM Tester is a specialized tool designed for 4 & 8 cylinder passenger vehicles. Made by Dixson Inc. in the United States, this analog display tester comes with clamps for easy installation. Although it does not come with a warranty, this model #1501 is known to work effectively in diagnosing tach and dwell issues in vehicles. Perfect for automotive enthusiasts and service professionals looking for a reliable diagnostic tool.