Check the listing for details. Sears Tune Up Tester Model 181- 2190 (working condition unknown). Condition: Used, Made in United States. Listed at 16.50 USD. The Sears Tune Up Tester Model 181-2190 is a vintage diagnostic tool designed to check the performance of automotive engines. Made by Sears in the United States, this analog tester is specifically designed to determine the tune-up condition of vehicles. With a manufacturer part number of 2105, this tool is a valuable addition to any mechanic's arsenal, allowing for accurate and efficient tuning of engines. Ideal for car enthusiasts and professionals alike, this Sears Tune Up Tester is a reliable and essential tool for maintaining optimal engine performance.