The best option, if available for your vehicle, is to use the Patton Machine conversion for Lucas distributors which will allow the onboard computer to have complete control over ignition mapping. Alternatively,  you can use any ignition system that produces a square wave to fire the coil, but you will need to use our Tach Filter to provide timing pulses to the on board computer. Use of the Tach filter and your ignition system does not allow for computer controlled ignition mapping.  Some systems suitable for use with a Tach Filter are: Pertronix, Crane and 123. If you have any doubt about compatibility, please ask. The Tach Filter will not work with points.