Abstract: A tune up device for a distributor of an internal combustion engine having an adaptor adjustably mounted on the distributor adjacent to the distributor cam, and a replaceable module having contact points positioned on the distributor, wherein once the adaptor is positioned, it provides the proper setting for the contact point gap or dwell angle. When the adaptor has been installed the gap between the contact points and dwell angle remains the same from the initial module to each replaceable module. Further settings are not necessary. Each time the tune up is desired the module is removed and simply replaced.