The Vintage Harvey E. Hanson Engine Vacuum Tester is a specialized tool designed for diagnostic engine testing. Specifically made for gasoline engines, this vintage tester is reliable for motorcycle, ATV, passenger vehicle, and heavy-duty/commercial vehicles. The gauge, labeled as Vintage No.6, provides accurate readings for fuel pump function and engine vacuum levels, ensuring proper maintenance and performance of the engine. Perfect for collectors or DIY mechanics looking to add a unique tool to their collection. It is unknown whether this works I have not tested it
