diff --git a/config/machineGroup.json b/config/machineGroup.json
index 69ec2e2..9f916a0 100644
--- a/config/machineGroup.json
+++ b/config/machineGroup.json
@@ -122,7 +122,12 @@
         }
       ],
       "title": "Scaling",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "scaling"
+        ]
+      }
     },
     {
       "datasource": {
@@ -174,7 +179,12 @@
         }
       ],
       "title": "Abs Dist Peak",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "absDistFromPeak"
+        ]
+      }
     },
     {
       "datasource": {
@@ -227,7 +237,12 @@
         }
       ],
       "title": "Rel Dist Peak",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "relDistFromPeak"
+        ]
+      }
     },
     {
       "gridPos": {
@@ -253,7 +268,58 @@
             "fillOpacity": 10
           }
         },
-        "overrides": []
+        "overrides": [
+          {
+            "matcher": {
+              "id": "byRegexp",
+              "options": ".+\\.min$"
+            },
+            "properties": [
+              {
+                "id": "custom.lineStyle",
+                "value": {
+                  "fill": "dash",
+                  "dash": [
+                    10,
+                    10
+                  ]
+                }
+              },
+              {
+                "id": "color",
+                "value": {
+                  "mode": "fixed",
+                  "fixedColor": "orange"
+                }
+              }
+            ]
+          },
+          {
+            "matcher": {
+              "id": "byRegexp",
+              "options": ".+\\.max$"
+            },
+            "properties": [
+              {
+                "id": "custom.lineStyle",
+                "value": {
+                  "fill": "dash",
+                  "dash": [
+                    10,
+                    10
+                  ]
+                }
+              },
+              {
+                "id": "color",
+                "value": {
+                  "mode": "fixed",
+                  "fixedColor": "red"
+                }
+              }
+            ]
+          }
+        ]
       },
       "gridPos": {
         "h": 8,
@@ -278,7 +344,13 @@
         }
       ],
       "title": "Total Flow",
-      "type": "timeseries"
+      "type": "timeseries",
+      "meta": {
+        "emittedFields": [
+          "flow.total",
+          "flow.group"
+        ]
+      }
     },
     {
       "datasource": {
@@ -293,7 +365,58 @@
             "fillOpacity": 10
           }
         },
-        "overrides": []
+        "overrides": [
+          {
+            "matcher": {
+              "id": "byRegexp",
+              "options": ".+\\.min$"
+            },
+            "properties": [
+              {
+                "id": "custom.lineStyle",
+                "value": {
+                  "fill": "dash",
+                  "dash": [
+                    10,
+                    10
+                  ]
+                }
+              },
+              {
+                "id": "color",
+                "value": {
+                  "mode": "fixed",
+                  "fixedColor": "orange"
+                }
+              }
+            ]
+          },
+          {
+            "matcher": {
+              "id": "byRegexp",
+              "options": ".+\\.max$"
+            },
+            "properties": [
+              {
+                "id": "custom.lineStyle",
+                "value": {
+                  "fill": "dash",
+                  "dash": [
+                    10,
+                    10
+                  ]
+                }
+              },
+              {
+                "id": "color",
+                "value": {
+                  "mode": "fixed",
+                  "fixedColor": "red"
+                }
+              }
+            ]
+          }
+        ]
       },
       "gridPos": {
         "h": 8,
@@ -318,7 +441,13 @@
         }
       ],
       "title": "Total Power",
-      "type": "timeseries"
+      "type": "timeseries",
+      "meta": {
+        "emittedFields": [
+          "power.total",
+          "power.group"
+        ]
+      }
     }
   ],
   "schemaVersion": 39,
diff --git a/test/basic/slice40-mgc-template.basic.test.js b/test/basic/slice40-mgc-template.basic.test.js
new file mode 100644
index 0000000..1f8fa60
--- /dev/null
+++ b/test/basic/slice40-mgc-template.basic.test.js
@@ -0,0 +1,69 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DashboardApi = require('../../src/specificClass.js');
+
+test('MGC template panels are all group-level (no per-pump fields)', () => {
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machineGroup');
+  const PER_PUMP = new Set(['ctrl', 'state', 'runtime', 'pressure.upstream', 'pressure.downstream', 'temperature']);
+  for (const panel of dash.panels || []) {
+    if (panel.type === 'row') continue;
+    const fields = panel?.meta?.emittedFields || [];
+    for (const f of fields) {
+      assert.ok(!PER_PUMP.has(f),
+        `MGC panel "${panel.title}" emits ${f}, which belongs to rotatingMachine (per-pump). Move to children.`);
+    }
+  }
+});
+
+test('MGC group panels are annotated (mode, scaling, abs/rel peak, totals)', () => {
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machineGroup');
+  const non = dash.panels.filter((p) => p.type !== 'row');
+  const annotated = non.filter((p) => p?.meta?.emittedFields);
+  assert.equal(annotated.length, non.length, 'every non-row MGC panel annotated');
+});
+
+test('MGC timeseries panels carry dashed-bounds overrides for .min/.max', () => {
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machineGroup');
+  const ts = dash.panels.filter((p) => p.type === 'timeseries');
+  for (const panel of ts) {
+    const ov = panel?.fieldConfig?.overrides || [];
+    const hasMin = ov.some((o) => o.matcher?.id === 'byRegexp' && /\.min\$/.test(o.matcher?.options || ''));
+    const hasMax = ov.some((o) => o.matcher?.id === 'byRegexp' && /\.max\$/.test(o.matcher?.options || ''));
+    assert.ok(hasMin && hasMax, `MGC ts panel "${panel.title}" missing .min/.max dashed override`);
+  }
+});
+
+test('MGC composer dedups parent panels covered by pump children', () => {
+  // If a rotatingMachine child claims to emit `flow.total` (it shouldn't, but
+  // suppose), the parent MGC's "Total Flow" panel would be removed. Verify
+  // the composer applies the same dedup rule to MGC parents.
+  const api = new DashboardApi({});
+  function makeChildSrc(id) {
+    return { config: { general: { id }, functionality: { softwareType: 'machine', positionVsParent: 'downstream' } } };
+  }
+  const child = makeChildSrc('pump-1');
+  const root = {
+    config: { general: { id: 'mgc-1', name: 'MGC' }, functionality: { softwareType: 'machineGroupControl', positionVsParent: 'atequipment' } },
+    childRegistrationUtils: { registeredChildren: new Map([['pump-1', { child, position: 'downstream', softwareType: 'machine' }]]) },
+  };
+  const origLoad = api.loadTemplate.bind(api);
+  api.loadTemplate = function (t) {
+    const dash = origLoad(t);
+    if (t === 'machine') {
+      // Make the pump's template falsely claim it emits flow.total/flow.group
+      const firstPanel = dash.panels.find((p) => p.type !== 'row');
+      if (firstPanel) (firstPanel.meta ||= {}).emittedFields = ['flow.total', 'flow.group'];
+    }
+    return dash;
+  };
+  const results = api.generateDashboardsForGraph(root);
+  const mgcDash = results[0].dashboard;
+  const totalFlowPanel = mgcDash.panels.find((p) => p.title === 'Total Flow');
+  assert.ok(!totalFlowPanel, 'MGC Total Flow panel should be removed when child claims flow.total/flow.group');
+});