This vintage Simpson Auto Ranger Tach Dwell Ignition Tester Model TDI is a must-have for any automotive enthusiast or mechanic. Made by the trusted brand Simpson, this tester is a reliable and efficient tool for diagnosing issues in your vehicle's ignition system. The manufacturer part number TDI ensures that you are getting the genuine Simpson product.

Perfect for use in diagnostic service tools, this tester is suitable for a wide range of electrical tests. With its compact design and easy-to-use features, the Simpson Auto Ranger Tach Dwell Ignition Tester Model TDI is a great addition to any toolbox.

This unit is sold as is. I removed the 2 cell D batteries that were corroded. The one wire attachment came off inside the unit and needs to be soldered back on. The rest of the unit is very clean inside.