diff --git a/plugins/lua/buildingplan.lua b/plugins/lua/buildingplan.lua
index d64317eb0..7e034b988 100644
--- a/plugins/lua/buildingplan.lua
+++ b/plugins/lua/buildingplan.lua
@@ -14,6 +14,7 @@ local _ENV = mkmodule('plugins.buildingplan')
 
 local argparse = require('argparse')
 local inspector = require('plugins.buildingplan.inspectoroverlay')
+local mechanisms = require('plugins.buildingplan.mechanisms')
 local pens = require('plugins.buildingplan.pens')
 local planner = require('plugins.buildingplan.planneroverlay')
 require('dfhack.buildings')
@@ -134,12 +135,14 @@ function reload_modules()
     reload('plugins.buildingplan.itemselection')
     reload('plugins.buildingplan.planneroverlay')
     reload('plugins.buildingplan.inspectoroverlay')
+    reload('plugins.buildingplan.mechanisms')
     reload('plugins.buildingplan')
 end
 
 OVERLAY_WIDGETS = {
     planner=planner.PlannerOverlay,
     inspector=inspector.InspectorOverlay,
+    mechanisms=mechanisms.MechanismOverlay,
 }
 
 return _ENV
diff --git a/plugins/lua/buildingplan/mechanisms.lua b/plugins/lua/buildingplan/mechanisms.lua
new file mode 100644
index 000000000..b3475be2b
--- /dev/null
+++ b/plugins/lua/buildingplan/mechanisms.lua
@@ -0,0 +1,69 @@
+local _ENV = mkmodule('plugins.buildingplan.mechanisms')
+
+local overlay = require('plugins.overlay')
+local widgets = require('gui.widgets')
+
+--------------------------------
+-- MechanismOverlay
+--
+
+MechanismOverlay = defclass(MechanismOverlay, overlay.OverlayWidget)
+MechanismOverlay.ATTRS{
+    default_pos={x=5,y=5},
+    default_enabled=true,
+    viewscreens='dwarfmode/LinkingLever',
+    frame={w=57, h=13},
+}
+
+function MechanismOverlay:init()
+    self:addviews{
+        widgets.CycleHotkeyLabel{
+            view_id='safety1',
+            frame={t=4, l=4, w=40},
+            key='CUSTOM_G',
+            label='Lever mechanism safety:',
+            options={
+                {label='Any', value=0},
+                {label='Magma', value=2, pen=COLOR_RED},
+                {label='Fire', value=1, pen=COLOR_LIGHTRED},
+            },
+            initial_option=0,
+        },
+        widgets.CycleHotkeyLabel{
+            view_id='safety2',
+            frame={t=5, l=4, w=40},
+            key='CUSTOM_SHIFT_G',
+            label='Target mechanism safety:',
+            options={
+                {label='Any', value=0},
+                {label='Magma', value=2, pen=COLOR_RED},
+                {label='Fire', value=1, pen=COLOR_LIGHTRED},
+            },
+            initial_option=0,
+        },
+        widgets.HotkeyLabel{
+            frame={t=6, l=9, w=48, h=3},
+            key='CUSTOM_M',
+            label='Choose',
+            auto_height=false,
+            on_activate=function() end,
+        },
+        widgets.HotkeyLabel{
+            frame={t=9, l=9, w=48, h=3},
+            key='CUSTOM_SHIFT_M',
+            label='Choose',
+            auto_height=false,
+            on_activate=function() end,
+        },
+    }
+end
+
+function MechanismOverlay:onInput(keys)
+    if keys._MOUSE_L and self:getMousePos() then
+        MechanismOverlay.super.onInput(self, keys)
+        -- don't let clicks bleed through the panel
+        return true
+    end
+end
+
+return _ENV