I'm new to automotive customizing and the aluminum threaded cover for my original Lotus Europa brake master cylinder sovy device is no longer available. From years of pauper existence, I have've had to hack what's broken, usually to positive results.This is no different.
The original design is as simple as they get. A cork, attached to a rod with a metal washer attached to it, floats in the brake fluid reservoir. As the fluid level drops, the cork drops as well. When the washer gets low enough, it comes to rest on 2 contacts, closing the warning light circuit... Simple.
Unscrew the heavy billet aluminum piece from your plastic brake fluid tank and let's get started.