Sierra 18-99218 2 Cyl Mercury Switch Box Replaces CDI 114-6222This Sierra power pack is for use with Johnson/Evinrude outboard engines with no RPM limits.Sierra 18-99218 Power Pack Application InformationThis power pack is used in various Mercury Outboard engines: Mercury 4HP Model 40 from 1976-1980; Mercury 7.5HP Model 75 from 1974-1986; Mercury 9.8HP Model 110 from 1974-1985; Mercury 20HP from 1974-1981; What is the 18-99218 Power Pack Interchangeable with? CDI; 114-6222; Mercury; 222A1; 6222A10; 6222A4; Click here for Sierra 18-99218 2 Cyl Switch Box Installation Instructions