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;