The Lumenition standard Optronic and Performance Optronic Ignitions convert a large range of contact breaker distributors to electronic ignition. It is immune to dirt, cam wear and dust, has no moving parts to wear out and is maintenance free. With more than half a million sold Worldwide over 43 years, Optronic ignitions are the premier contact breaker replacement system. Entirely manufactured in the UK under Autocar's strict quality control and with excellent expert support services, the system has has an eviable reputation for ease of fitment, consistancy and reliability and for many years been a favorite with car owners, racers and engine buillders alike.... The Optronic ignition replaces points and condensors by mounting an optical switch in the distributor using a distributor-specific fitting kit. A fan-like “chopper” fitted is over the distributor cam, rotates through the optical switch, breaks the infrared beam and triggers the external power module to fire the coil. This produces a perfectly timed, rock solid spark.Only 3 wires are connected to the vehicle: one to the ignition switch, one to the vehicle body earth and the third to the negative terminal of the coil. The engine is then ready to be timed. By using the distributor's original vacuum and mechanical advance mechanism, Optronic ignitions ensure your engine timing is the one the manufacturer developed for the vehicle. Lumenition Optronic ignitions are : • Highly reliable with many units still in operation after 25 years. • Completely maintenance free • Precise and accurate electronic switching improving engine smoothness and performance • Easier starting • Improves performance of older or worn distributors. • Fully compatible with Lumenition and Micro Dynamics rev limiters and shift lights.