Compu-Fire 20100 Ignition Model 20100 Converts outdated points system to an accurate electronic ignition system Utilizes the mechanical advance 1980 and later electronic conversions require a mechanical advance Includes rotor with kit Mechanical advance, dual fire, single plug. Uses blue rotor (included). Use to convert points ignition to Compu-Fire electronic ignition. 1980 and later electronic conversions require mechanical advance Bikers Choice #21-5533, 21-6561 and 21-2060 HD#32517-70