The Equus 3022, or 7-Function Engine Analyzer, is a vintage diagnostic tool used for measuring engine RPM, dwell angle, voltage, and resistance, featuring an inductive pickup for timing. It facilitates essential automotive maintenance through functions such as tachometer readings, battery checks, and ignition point testing. For official documentation and manual support, visit the iEquus Product Manuals page . Equus Automotive Multimeters & Analyzers for sale - eBay