diff --git a/gui/pygauge.py b/gui/pygauge.py
index e1b9a83e2..df3f6cab5 100644
--- a/gui/pygauge.py
+++ b/gui/pygauge.py
@@ -240,11 +240,12 @@ class PyGauge(wx.PyWindow):
             r = copy.copy(rect)
             r.width = w
             r.height = r.height/2+1
+            pv= 100 *  (float(value if value <= self._range else self._range) / self._range)
             if value <= self._range:
-                c1 = map(lambda t: sum(t), zip(c1, (3*w/4,-w,-w,0)))
-                c2 = map(lambda t: sum(t), zip(c2, (3*w/4,-w,-w,0)))
+                c1 = map(lambda t: sum(t), zip(c1, (3*pv/4,-pv,-pv,0)))
+                c2 = map(lambda t: sum(t), zip(c2, (3*pv/4,-pv,-pv,0)))
             else:
-                c1 = map(lambda t: sum(t), zip(c2, (w/3,-w,-w,0)))
+                c1 = map(lambda t: sum(t), zip(c2, (pv/2,-pv/2,-pv/2,0)))
                 c2 = wx.Colour(255,0,0)
 
             dc.GradientFillLinear(r, c1, c2, wx.SOUTH)