This is the correct original style Sprite Mark 1 and 2 generator, equipped with the threads and output for a mechanical tach drive. Choose "generator only" to reuse your tach drive gearbox or "generator with tach drive gearbox" if you would like the add-on gearbox to spin your tachometer cable. 

This Generator / Dynamo can be used with a positive ground or a negative ground car.

When replacing the generator, it's a good idea to replace the voltage regulator, we have a which will regulate without adjusting!

If you need a generator for a later Spridget that does not have a tachometer drive port on the back, .