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.
Additional Fitment Information:
1991 - Chevrolet C3500
8 Cyl 7.4L
1 Products for Engine Wiring Harness.