diff --git a/tach_sensor.cpp b/tach_sensor.cpp
new file mode 100644
index 0000000..1325365
--- /dev/null
+++ b/tach_sensor.cpp
@@ -0,0 +1,18 @@
+#include "tach_sensor.hpp"
+
+
+namespace phosphor
+{
+namespace fan
+{
+namespace presence
+{
+
+bool TachSensor::isPresent()
+{
+    return false;
+}
+
+} // namespace presence
+} // namespace fan
+} // namespace phosphor