diff --git a/tach_sensor.cpp b/tach_sensor.cpp
index 1325365..987e390 100644
--- a/tach_sensor.cpp
+++ b/tach_sensor.cpp
@@ -10,7 +10,7 @@
 
 bool TachSensor::isPresent()
 {
-    return false;
+    return (tach != 0);
 }
 
 } // namespace presence