To run twin-ignition in a 914-6 GT, you need a pair of 3-Pin CDI boxes https://pbase.com/9146gt/image/26094080, to run the CDI boxes you'll also need two wiring-harnesses, like these here https://pbase.com/9146gt/image/166948174/original Bernie Buschen at European Autowerke made for my car. Can't wait to see those installed and wired in the ignition system. Thank you Bernie.

911 CDI harness discussion post, diagrams http://www.early911sregistry.org/forums/showthread.php?122060-CDI-wiring-help

911 CDI Twin Harnesses http://www.partsklassik.com/c-71-twin-plug-ignition_porsche-911.aspx ~ http://www.partsklassik.com/p-946-cdi-three-pin-wiring-harness.aspx