# Gauge · Pro

A dial gauge with colour bands and tick marks whose needle swings to the value on an underdamped spring, overshooting a touch, while the readout counts along.

This is a Charcoal UI Pro component. Its source and examples are available with a Pro seat: https://charcoalui.com/pricing

## With a Pro seat

1. Add the registry to components.json:

```json
{
  "registries": {
    "@charcoal": {
      "url": "https://charcoalui.com/r/{name}.json",
      "headers": {
        "Authorization": "Bearer ${CHARCOAL_LICENSE_KEY}"
      }
    }
  }
}
```

2. Copy your licence key from https://charcoalui.com/dashboard and put it in .env.local as CHARCOAL_LICENSE_KEY, then:

```bash
npx shadcn@latest add @charcoal/gauge
```

To read Pro source through this MCP server, reconnect it with the header "Authorization: Bearer <licence key>".

## API — Gauge
| Prop | Type | Default | Notes |
| --- | --- | --- | --- |
| `value` | `number` | — |  |
| `min` | `number` | `0` |  |
| `max` | `number` | `100` |  |
| `size` | `number` | `200` |  |
| `arc` | `number` | `240` | Degrees the arc spans. |
| `bands` | `{ to: number; color: string }[]` | — |  |
| `label` | `string` | `"Gauge"` |  |
| `format` | `(v: number) => string` | — |  |
| `ticks` | `number` | `9` |  |
| `className` | `string` | — |  |

See it live: https://charcoalui.com/docs/components/gauge