MSD Ignition control are easy to install, but we also offer several direct plug-in harnesses for late model vehicles! The harnesses plug directly into your factory coil and harness then four color coded wires plug into the corresponding wires of the MSD. Product Features:Plug-In Harness w/Color Coded WiresNo Cutting Or SplicingQuick Easy InstallationProvides A Direct Plug-In InstallationWhen Adding An MSD Ignition Control