MSD’s universal ignition tester (PN 89981) helps identify and get rid of unwanted ignition gremlins in single channel and coil-on-plug applications. It can perform battery diagnostics, test distributor signal, verify RPM-activated switches, simulate a ¼ mile pass with the RPM Run Mode feature, and so much more. Follow along in this video as we show you how to use the universal tester to ensure your ignition system is in tip-top shape. Learn More: https://www.holley.com/products/tools/ignition_to