diff --git a/drawing/Common.lua b/drawing/Common.lua
index 9bbde4f..e99bab3 100644
--- a/drawing/Common.lua
+++ b/drawing/Common.lua
@@ -2,6 +2,8 @@ local M = {}
 
 local Util = require 'Util'
 local Arc = require 'Arc'
+local Dial = require 'Dial'
+local CompoundDial = require 'CompoundDial'
 local Text = require 'Text'
 local CriticalText = require 'CriticalText'
 local TextColumn = require 'TextColumn'
@@ -277,8 +279,22 @@ M.text_ring_set = function(tr, cr, value)
 end
 
 --------------------------------------------------------------------------------
--- separator (eg a horizontal line)
+-- dial
 
+M.dial = function(x, y, radius, thickness, threshold)
+   return _G_Widget_.Dial(
+      _G_Widget_.make_semicircle(x, y, radius, 90, 360),
+      _G_Widget_.arc_style(thickness, _G_Patterns_.INDICATOR_BG),
+      _G_Widget_.threshold_style(
+         _G_Patterns_.INDICATOR_FG_PRIMARY,
+         _G_Patterns_.INDICATOR_FG_CRITICAL,
+         threshold
+      )
+   )
+end
+
+--------------------------------------------------------------------------------
+-- separator (eg a horizontal line)
 
 M.initSeparator = function(x, y, w)
    return _G_Widget_.Line(
diff --git a/drawing/Memory.lua b/drawing/Memory.lua
index 62d991b..7bad6f3 100644
--- a/drawing/Memory.lua
+++ b/drawing/Memory.lua
@@ -54,18 +54,7 @@ local DIAL_THETA_1 = math.rad(360)
 local DIAL_X = _G_INIT_DATA_.RIGHT_X + DIAL_RADIUS + _DIAL_THICKNESS_ / 2
 local DIAL_Y = header.bottom_y + DIAL_RADIUS + _DIAL_THICKNESS_ / 2
 
-local dial = _G_Widget_.Dial(
-   _G_Widget_.make_semicircle(DIAL_X, DIAL_Y, DIAL_RADIUS, 90, 360),
-   _G_Widget_.arc_style(
-      _DIAL_THICKNESS_,
-      _G_Patterns_.INDICATOR_BG
-   ),
-   _G_Widget_.threshold_style(
-      _G_Patterns_.INDICATOR_FG_PRIMARY,
-      _G_Patterns_.INDICATOR_FG_CRITICAL,
-      0.8
-   )
-)
+local dial = Common.dial(DIAL_X, DIAL_Y, DIAL_RADIUS, _DIAL_THICKNESS_, 0.8)
 local cache_arc = _G_Widget_.Arc(
    _G_Widget_.make_semicircle(DIAL_X, DIAL_Y, DIAL_RADIUS, 90, 360),
    _G_Widget_.arc_style(