diff --git a/py/hexagram/cluster.py b/py/hexagram/cluster.py
index 84d52af..ea975fb 100644
--- a/py/hexagram/cluster.py
+++ b/py/hexagram/cluster.py
@@ -70,12 +70,13 @@ class ShiftIndicator(Gauge):
         (4,),
     )
 
-    __slots__ = 'x', 'y', 'redline',
+    __slots__ = 'x', 'y', 'rpm_redline', 'rpm_max',
 
-    def __init__(self, x: float, y: float, redline: float):
-        self.x       = x
-        self.y       = y
-        self.redline = redline
+    def __init__(self, x: float, y: float, rpm_redline: float, rpm_max: float):
+        self.x           = x
+        self.y           = y
+        self.rpm_redline = rpm_redline
+        self.rpm_max     = rpm_max
 
     def draw_bg(self, cr: cairo.Context):
         for level in range(0, len(self.LIGHT_LEVELS)):
@@ -104,7 +105,7 @@ class Cluster():
 
     __slots__ = 'gauges',
 
-    def __init__(self, redline: float):
+    def __init__(self, rpm_redline: float, rpm_max: float):
         self.gauges = list()
 
         for x in (self.HEIGHT / 2, self.WIDTH - self.HEIGHT / 2):
@@ -112,7 +113,8 @@ class Cluster():
 
         self.gauges.append(ShiftIndicator(self.SHIFT_INDICATOR_X,
                                           self.SHIFT_INDICATOR_Y,
-                                          redline))
+                                          rpm_redline,
+                                          rpm_max))
 
     def draw_bg(self, cr: cairo.Context):
         cr.set_source_rgb(0, 0, 0)