Rpm Modules 5000 Series Kit Even Increments Marine Only Use With 6M-2L Marine Box Pn 6560 MSD IgnitionRPM Module Kits include five modules in 200 rpm increments. Each kit is within a 1,000 rpm range. For example, the PN 87456 is supplied with: 5,000, 5,200, 5,400, 5,600, 5,800 modules. Designed to be used only with MSD 6M 2L Marine Ignition Comes as a pack of (5) modules in 5000, 5200, 5400, 5600, and 5800rpm levels Details: Emission Code: 5 Warranty: Manufacturer's Limited 1 Year Warranty