This 123 Ignition Distributor is specifically designed to replace Lucas distributors on classic Mini A-Plus engines (There is another distributor for pre-A-Plus engines, refer to 080.803). The static timing can be done on TDC, by means of the built-in LED. It offers 16 different advance-curves that can be selected via a little switch which enables you to fine tune your engine. It also offers automatic dwell, spark balancing, automatic power cut off one second after the engine stops. The installation manual also offers a comprehensive list, that links a curve setting to a particular Lucas distributor number. This distributor can be wired for positive or negative earth vehicles