This is a simple, drop in unit. The coil is inside the cap and the module is inside the distributor. Just run one 12-volt wire to the distributor and you're ready to run! There is also an optional tach hook-up. The D.U.I eliminates ALL of the messy wiring found on stock AMC electronic ignition systems. This really cleans up the engine compartment. Features: internal coil and module, simple one-wire hook-up, custom tailored advance curve, allows for wider plug gaps, instant throttle response, more voltage-no resistor, upper and lower bushings for durability (stock AMC only has 1 bushing), includes 50,000 volt coil and Dyna-module, and easy to find replacement parts.