diff --git a/src/Reveal.Sdk.Dom.Tests/Visualizations/LinearGaugeVisualizationFixture.cs b/src/Reveal.Sdk.Dom.Tests/Visualizations/LinearGaugeVisualizationFixture.cs
new file mode 100644
index 00000000..0b0e5ce5
--- /dev/null
+++ b/src/Reveal.Sdk.Dom.Tests/Visualizations/LinearGaugeVisualizationFixture.cs
@@ -0,0 +1,232 @@
+using System.Collections.Generic;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Reveal.Sdk.Dom.Data;
+using Reveal.Sdk.Dom.Visualizations;
+using Xunit;
+
+namespace Reveal.Sdk.Dom.Tests.Visualizations;
+
+public class LinearGaugeVisualizationFixture
+{
+    [Fact]
+    public void Constructor_FieldsHaveDefaultValues_WhenInstanceIsCreated()
+    {
+        // Act
+        var visualization = new LinearGaugeVisualization();
+
+        // Assert
+        Assert.Null(visualization.Title);
+        Assert.Null(visualization.DataDefinition);
+        Assert.Equal(ChartType.LinearGauge, visualization.ChartType);
+    }
+
+    [Fact]
+    public void Constructor_SetsDataSourceItem_WhenOnlyDataSourceItemProvided()
+    {
+        // Arrange
+        var dataSourceItem = new DataSourceItem();
+
+        // Act
+        var visualization = new LinearGaugeVisualization(dataSourceItem);
+
+        // Assert
+        Assert.Equal(dataSourceItem, visualization.DataDefinition.DataSourceItem);
+        Assert.Equal(ChartType.LinearGauge, visualization.ChartType);
+    }
+
+    [Fact]
+    public void Constructor_SetsTitleAndDataSourceItem_WhenBothArgumentsAreProvided()
+    {
+        // Arrange
+        var title = "Test Linear Gauge";
+        var dataSourceItem = new DataSourceItem();
+
+        // Act
+        var visualization = new LinearGaugeVisualization(title, dataSourceItem);
+
+        // Assert
+        Assert.Equal(title, visualization.Title);
+        Assert.Equal(dataSourceItem, visualization.DataDefinition.DataSourceItem);
+        Assert.Equal(ChartType.LinearGauge, visualization.ChartType);
+    }
+
+    [Fact]
+    public void ToJsonString_GeneratesCorrectJson_WhenSerialized()
+    {
+        // Arrange
+        var expectedJson =
+            """
+            [ {
+              "Id" : "6f72810e-cc44-4a80-90ad-4b9c9162d44b",
+              "Title" : "Linear Gauge",
+              "IsTitleVisible" : true,
+              "ColumnSpan" : 0,
+              "RowSpan" : 0,
+              "VisualizationSettings" : {
+                "_type" : "GaugeVisualizationSettingsType",
+                "ViewType" : "Linear",
+                "GaugeBands" : [ {
+                  "_type" : "GaugeBandType",
+                  "Type" : "NumberValue",
+                  "Color" : "Green",
+                  "Value" : 10000.0
+                }, {
+                  "_type" : "GaugeBandType",
+                  "Type" : "NumberValue",
+                  "Color" : "Yellow",
+                  "Value" : 5000.0
+                }, {
+                  "_type" : "GaugeBandType",
+                  "Type" : "NumberValue",
+                  "Color" : "Red"
+                } ],
+                "VisualizationType" : "GAUGE"
+              },
+              "DataSpec" : {
+                "_type" : "TabularDataSpecType",
+                "IsTransposed" : false,
+                "Fields" : [ {
+                  "FieldName" : "Date",
+                  "FieldLabel" : "Date",
+                  "UserCaption" : "Date",
+                  "IsCalculated" : false,
+                  "Properties" : { },
+                  "Sorting" : "None",
+                  "FieldType" : "Date"
+                }, {
+                  "FieldName" : "Spend",
+                  "FieldLabel" : "Spend",
+                  "UserCaption" : "Spend",
+                  "IsCalculated" : false,
+                  "Properties" : { },
+                  "Sorting" : "None",
+                  "FieldType" : "Number"
+                } ],
+                "TransposedFields" : [ ],
+                "QuickFilters" : [ ],
+                "AdditionalTables" : [ ],
+                "ServiceAdditionalTables" : [ ],
+                "DataSourceItem" : {
+                  "_type" : "DataSourceItemType",
+                  "Id" : "080cc17d-4a0a-4837-aa3f-ef2571ea443a",
+                  "Title" : "Sample Data",
+                  "Subtitle" : "Excel Data Source Item",
+                  "DataSourceId" : "__JSON",
+                  "HasTabularData" : true,
+                  "HasAsset" : false,
+                  "Properties" : { },
+                  "Parameters" : {
+                    "config" : {
+                      "iterationDepth" : 0,
+                      "columnsConfig" : [ {
+                        "key" : "Date",
+                        "type" : 2
+                      }, {
+                        "key" : "Spend",
+                        "type" : 1
+                      } ]
+                    }
+                  },
+                  "ResourceItem" : {
+                    "_type" : "DataSourceItemType",
+                    "Id" : "d593dd79-7161-4929-afc9-c26393f5b650",
+                    "Title" : "Marketing Sheet",
+                    "Subtitle" : "Excel Data Source Item",
+                    "DataSourceId" : "33077d1e-19c5-44fe-b981-6765af3156a6",
+                    "HasTabularData" : true,
+                    "HasAsset" : false,
+                    "Properties" : {
+                      "Url" : "http://dl.infragistics.com/reportplus/reveal/samples/Samples.xlsx"
+                    },
+                    "Parameters" : { }
+                  }
+                },
+                "Expiration" : 1440,
+                "Bindings" : {
+                  "Bindings" : [ ]
+                }
+              },
+              "VisualizationDataSpec" : {
+                "_type" : "LinearGaugeVisualizationDataSpecType",
+                "Value" : [ {
+                  "_type" : "MeasureColumnSpecType",
+                  "SummarizationField" : {
+                    "_type" : "SummarizationValueFieldType",
+                    "FieldLabel" : "Spend",
+                    "UserCaption" : "Spend",
+                    "IsHidden" : false,
+                    "AggregationType" : "Sum",
+                    "Sorting" : "None",
+                    "IsCalculated" : false,
+                    "FieldName" : "Spend"
+                  }
+                } ],
+                "Target" : [ ],
+                "FormatVersion" : 0,
+                "AdHocExpandedElements" : [ ],
+                "Rows" : [ {
+                  "_type" : "DimensionColumnSpecType",
+                  "SummarizationField" : {
+                    "_type" : "SummarizationDateFieldType",
+                    "DateAggregationType" : "Month",
+                    "DrillDownElements" : [ ],
+                    "ExpandedItems" : [ ],
+                    "FieldName" : "Date"
+                  }
+                } ]
+              }
+            } ]
+            """;
+
+        var document = new RdashDocument("Dashboard");
+
+        var dataSourceItem = new RestDataSourceItem("Sample Data")
+        {
+            Id = "080cc17d-4a0a-4837-aa3f-ef2571ea443a",
+            Subtitle = "Excel Data Source Item",
+            Url = "http://dl.infragistics.com/reportplus/reveal/samples/Samples.xlsx",
+            IsAnonymous = true,
+            ResourceItem = new DataSourceItem
+            {
+                Id = "d593dd79-7161-4929-afc9-c26393f5b650",
+                DataSourceId = "33077d1e-19c5-44fe-b981-6765af3156a6",
+                Title = "Marketing Sheet",
+                Subtitle = "Excel Data Source Item",
+                HasTabularData = true,
+                HasAsset = false,
+                Properties = new Dictionary<string, object>
+                {
+                    { "Url", "http://dl.infragistics.com/reportplus/reveal/samples/Samples.xlsx" }
+                }
+            },
+            Fields = new List<IField>
+            {
+                new DateField("Date"),
+                new NumberField("Spend"),
+            }
+        };
+
+        document.Visualizations.Add(new LinearGaugeVisualization("Linear Gauge", dataSourceItem)
+        {
+            Id = "6f72810e-cc44-4a80-90ad-4b9c9162d44b",
+            IsTitleVisible = true,
+        }
+            .SetLabel(new DateDataField("Date") { AggregationType = DateAggregationType.Month }).SetValue("Spend")
+        .ConfigureSettings(settings =>
+        {
+            settings.ValueComparisonType = ValueComparisonType.Number;
+            settings.UpperBand.Value = 10000;
+            settings.MiddleBand.Value = 5000;
+        }));;
+
+        // Act
+        var json = document.ToJsonString();
+        var actualJson = JObject.Parse(json)["Widgets"];
+        var actualNormalized = JsonConvert.SerializeObject(actualJson, Formatting.Indented);
+        var expectedNormalized = JArray.Parse(expectedJson).ToString(Formatting.Indented);
+
+        // Assert
+        Assert.Equal(expectedNormalized.Trim(), actualNormalized.Trim());
+    }
+}
\ No newline at end of file