diff --git a/include/ADCSensor.hpp b/include/ADCSensor.hpp
index e15ba0a..59b4450 100644
--- a/include/ADCSensor.hpp
+++ b/include/ADCSensor.hpp
@@ -7,7 +7,6 @@
 class ADCSensor : public Sensor
 {
   public:
-    std::string name;
     std::string configuration;
     ADCSensor(const std::string &path,
               sdbusplus::asio::object_server &objectServer,
@@ -18,7 +17,6 @@
     ~ADCSensor();
 
   private:
-    std::string path;
     sdbusplus::asio::object_server &objServer;
     boost::asio::posix::stream_descriptor inputDev;
     boost::asio::deadline_timer waitTimer;
diff --git a/include/CPUSensor.hpp b/include/CPUSensor.hpp
index c4fca5d..41cc02f 100644
--- a/include/CPUSensor.hpp
+++ b/include/CPUSensor.hpp
@@ -7,7 +7,6 @@
 class CPUSensor : public Sensor
 {
   public:
-    std::string name;
     std::string configuration;
     CPUSensor(const std::string &path, const std::string &objectType,
               sdbusplus::asio::object_server &objectServer,
@@ -20,7 +19,6 @@
     static constexpr unsigned int sensorPollMs = 1000;
 
   private:
-    std::string path;
     std::string objectType;
     sdbusplus::asio::object_server &objServer;
     std::shared_ptr<sdbusplus::asio::connection> dbusConnection;
diff --git a/include/HwmonTempSensor.hpp b/include/HwmonTempSensor.hpp
index 14cb6c7..117f286 100644
--- a/include/HwmonTempSensor.hpp
+++ b/include/HwmonTempSensor.hpp
@@ -7,7 +7,6 @@
 class HwmonTempSensor : public Sensor
 {
   public:
-    std::string name;
     std::string configuration;
     HwmonTempSensor(const std::string &path, const std::string &objectType,
                     sdbusplus::asio::object_server &objectServer,
@@ -18,7 +17,6 @@
     ~HwmonTempSensor();
 
   private:
-    std::string path;
     std::string objectType;
     sdbusplus::asio::object_server &objServer;
     boost::asio::posix::stream_descriptor inputDev;
diff --git a/include/TachSensor.hpp b/include/TachSensor.hpp
index 2dc6216..36e3eaa 100644
--- a/include/TachSensor.hpp
+++ b/include/TachSensor.hpp
@@ -1,6 +1,8 @@
 #pragma once
 
 #include <Thresholds.hpp>
+#include <boost/container/flat_map.hpp>
+#include <boost/container/flat_set.hpp>
 #include <sdbusplus/asio/object_server.hpp>
 #include <sensor.hpp>
 
@@ -23,23 +25,40 @@
     boost::asio::ip::tcp::socket inputDev;
     int fd;
 };
+
+class RedundancySensor
+{
+  public:
+    RedundancySensor(size_t count, const std::vector<std::string> &children,
+                     sdbusplus::asio::object_server &objectServer);
+    ~RedundancySensor();
+
+    void update(const std::string &name, bool failed);
+
+  private:
+    size_t count;
+    std::shared_ptr<sdbusplus::asio::dbus_interface> iface;
+    sdbusplus::asio::object_server &objectServer;
+    boost::container::flat_map<std::string, bool> statuses;
+};
+
 class TachSensor : public Sensor
 {
   public:
-    std::string name;
     std::string configuration;
     TachSensor(const std::string &path,
                sdbusplus::asio::object_server &objectServer,
                std::shared_ptr<sdbusplus::asio::connection> &conn,
                std::unique_ptr<PresenceSensor> &&presence,
+               std::unique_ptr<RedundancySensor> &redundancy,
                boost::asio::io_service &io, const std::string &fanName,
                std::vector<thresholds::Threshold> &&thresholds,
                const std::string &sensorConfiguration);
     ~TachSensor();
 
   private:
-    std::string path;
     sdbusplus::asio::object_server &objServer;
+    std::unique_ptr<RedundancySensor> &redundancy;
     std::shared_ptr<sdbusplus::asio::connection> dbusConnection;
     std::unique_ptr<PresenceSensor> presence;
     boost::asio::posix::stream_descriptor inputDev;
diff --git a/include/Thresholds.hpp b/include/Thresholds.hpp
index 4a07ca2..3f9aa79 100644
--- a/include/Thresholds.hpp
+++ b/include/Thresholds.hpp
@@ -48,7 +48,8 @@
                       const thresholds::Threshold &threshold,
                       std::shared_ptr<sdbusplus::asio::connection> &conn);
 
-void checkThresholds(Sensor *sensor);
+// returns false if a critical threshold has been crossed, true otherwise
+bool checkThresholds(Sensor *sensor);
 void assertThresholds(Sensor *sensor, thresholds::Level level,
                       thresholds::Direction direction, bool assert);
 } // namespace thresholds
diff --git a/include/sensor.hpp b/include/sensor.hpp
index a19b969..dc9cdbe 100644
--- a/include/sensor.hpp
+++ b/include/sensor.hpp
@@ -6,7 +6,15 @@
 constexpr size_t sensorFailedPollTimeMs = 5000;
 struct Sensor
 {
+    Sensor(const std::string& name, const std::string& path,
+           std::vector<thresholds::Threshold>&& thresholdData) :
+        name(name),
+        path(path), thresholds(std::move(thresholdData))
+    {
+    }
     virtual ~Sensor() = default;
+    std::string name;
+    std::string path;
     std::vector<thresholds::Threshold> thresholds;
     std::shared_ptr<sdbusplus::asio::dbus_interface> sensorInterface;
     std::shared_ptr<sdbusplus::asio::dbus_interface> thresholdInterfaceWarning;