Hi Mark, I have fitted 2 of these powerdynamos to an early and late 2c. The late 2c is the easiest, the kit contains the main bulk of items you need. You do need a 12 v battery, bulbs, flasher unit and horn. There is a mistake in the wiring instructions the neutral wire must not connect to the battery and the flywheel can rub on the outer casing. Fitting a gasket cures the flywheel catching the outer cover.
When fitted the lights are much better as the indicators, it also runs much better at low revs.
It is a great reliable upgrade to 30 plus year old ignition system.