Conversion wiring harness for retrofitting to: Vespatronic ignition system in Rally, Sprint, VBB, Super, VNA, VNB, etc. The retrofitting to a more modern alternator / ignition type is a tried and tested means to be more permanent and safer on the road. The non-contact CDI ignitions are almost indestructible and reliable, as is the light output with a modern, regulator-supported on-board electrical system.