Auto Meter 9117 Tachometer Adapter Allows any Auto Meter standard ignition tachometer, Pro-Shift Lite or RPM activated module to be used on distributorless ignition These adapters make your installation quick and easy Allow you to use any Auto Meter standard ignition tachometer, shift light, or rpm-activated module on most Supermag and Vertex magneto applications It is sold individually Designed for vehicles with coil-over-plug ignition systems, and other late model vehicles where no tachometer output or signal wire is available