14CUX Gauge

A browser dashboard for the Lucas 14CUX engine ECU: live engine data, stored fault codes and ECU information over a USB serial cable, using the Web Serial API. It is built on the comm14cux-ts library.

Open the app: kb1rma.github.io/14cux-gauge — it runs in Chrome, Edge or Opera on a desktop, with nothing to install. Demo mode works without a car.

Status: pre-release MVP.

Purpose

The 14CUX was fitted to V8-engined Land Rover vehicles from 1990 to 1995 and to several low-volume sports cars. Its diagnostic port exposes the ECU's memory. 14CUX Gauge reads that memory in the browser and shows it as a dashboard, with nothing to install.

It does the same job as RoverGauge, the existing Qt desktop app, but it is a separate, independently designed program and is not a port of it.

This project is not affiliated with or endorsed by the author of libcomm14cux or RoverGauge.

Design goals

14CUX Gauge is a diagnostic and troubleshooting tool, so accuracy comes first:

• Show what the ECU reported. Readings are not smoothed, averaged or interpolated, and history and recordings keep them at full precision in the ECU's units. Units are converted and values rounded only for display.
• One reading, one format. Each reading's unit and precision is defined once and used by the tiles, graphs and recordings alike. If precision ever becomes adjustable, it will be a single preference for the whole app.
• Graphs you can read numbers from. Labelled axes with gridlines, samples plotted at the time they were read, gaps where a reading was invalid, and the current, lowest and highest values as text.
• No reading is never zero. Missing, invalid and stale readings are shown as such.

See AGENTS.md for the full rules contributors follow.

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