Node-RED block in Snap4City Microservice library node-red-contrib-snap4city-user is "gauge-chart">
    <p>With this node you can add a gauge chart to an existing dashboard or a new one created by the node to show numbers.
    </p>

    <h3>Configurations</h3>

    <dl class="message-properties">
        <dt>dashboard
            <span class="property-type">string</span>
        </dt>
        <dd>Dashboard title to which the gauge chart will be added</dd>
        <dt>widget
            <span class="property-type">string</span>
        </dt>
        <dd> Title that will have the widget containing the gauge chart.</dd>
    </dl>

    <h3>Inputs</h3>
    <dl class="message-properties">
        <dd> A number directly in the payload that will be shown in the gauge chart or a JSON Object like the following:</dd>
        
<pre>  
{
    "metricId": [Service Uri Of A Sensor],
    "metricHighLevelType": "Sensor",
    "metricName": [The name of the Sensor],
    "metricType": [A measure recorded by the sensor]
}
</pre>
<pre>
{
    "metricId": [The ID of a KPI],
    "metricHighLevelType": "MyKPI",
    "metricName": [The name of the MyKPI],
    "metricType": [The type of the measure saved in the KPI]
}
</pre>
             
        An example of the JSON Object filled with correct data:</p>

<pre>
{
    "metricId": "http://www.disit.org/km4city/resource/tusc_weather_sensor_ow_3166540",
    "metricHighLevelType": "Sensor",
    "metricName": "tusc_weather_sensor_ow_3166540",
    "metricType": "airTemperature"
}
</pre>

<pre>
{
    "metricId": "17056579",
    "metricHighLevelType": "MyKPI",
    "metricName": "OBD2 - Intake Air Temperature",
    "metricType": "Temperature"
}
</pre>
</dl>