An early form of a modern fuel gauge was offered by the companies Index and Silma for retrofitting. Inspired by the rare originals of the Index and Silma brands, this repro model is a nice but also functional gimmick.
The indicator simply replaces the conventional fuel cap and is conveniently opened via a screw cap when refueling. This means you can always keep an eye on the tank contents without having to take a cumbersome gauge.
Your advantages:
A charming and functional detail - ideal for everyday use, meetings or as a stylish eye-catcher on a vintage Vespa.