diff --git a/config/APSPUTL.yaml b/config/APSPUTL.yaml
index 5767c34bc7c269eb4e94e5b59e0054b7fe86d7af..b8bbed054b572ecab28dd2ffa509d94c27672a42 100644
--- a/config/APSPUTL.yaml
+++ b/config/APSPUTL.yaml
@@ -98,11 +98,11 @@ variables:
   - name: [APSPU_FAN_period1,APSPU_FAN_period2,APSPU_FAN_period3]
     driver: I2C_PU
     devreg:  [MAX.TACH1,MAX.TACH2,MAX.TACH3]
-    bitoffset: 4
-    width: 12
+    bitoffset: 5
+    width: 11
     rw:  ro
     dtype: double
-    scale: 7.629395e-6 #FAN_TACHS/TACH_COUNT_FREQ/TACH_PERIODS = 1/8192/16
+    scale: 1.52588e-5 #FAN_TACHS/TACH_COUNT_FREQ/TACH_PERIODS = 1/8192/16 *2
     monitor: true
 
 methods: