MSD Ignition MSD29774: Replacement Wire Harness for 6AL Aug 17, 2017MSD 6-Series Ignitions set the standard for quick starts, increased power, smooth idle, crisp throttle response and reduced spark plug fouling. MSD ignitions are available in a several styles and install easily in a variety of applications. Digital 6A: Base model with multiple sparking, capacitive discharge (CD) ignition control.5/5(2)Brand: MSD Ignition MSD Ignition Ignition Box Wiring Harnesses - Free Shipping MSD Ignition Ignition Box Wiring Harnesses. You Have Selected. Display Options. Guided Navigation Display Options. Select the navigation view you prefer when narrowing your search. Wiring Harness, Replacement For Digital 6A, Digital 6A-L, Each MSD Ignition Ignition Wire Harness | JEGS MSD Ignition Plug-In Wiring Harness for Digital 6A & 6A-L Programmable Ignition Control Boxes MSD Ignition 8897 Part Number: 121-8897. Replacement Wiring Harness; For Use With MSD Power Grid-7 Ignition Control 121-7720; View Details. $19 Ships Monday Lowest Price Guarantee.