This compact unit features a built-in coil with a 120" 8.5 mm super conductor spark plug wire so there is no concern for the connection at the coil. The unit is completely potted and encased in a sturdy epoxy compound for protection against harsh environments. Once 12 volts and ground are applied to the only two wires of the unit, a high voltage spark is fired.An MSD spark plug wire boot and terminal come in the kit Complete potted for protection against harsh environments