diff --git a/G940LEDControl/Forms/MainFrm.dfm b/G940LEDControl/Forms/MainFrm.dfm
index 2d46e27..637855c 100644
--- a/G940LEDControl/Forms/MainFrm.dfm
+++ b/G940LEDControl/Forms/MainFrm.dfm
@@ -1175,4 +1175,27 @@ object MainForm: TMainForm
     Left = 300
     Top = 436
   end
+  object ScriptErrorDialog: TTaskDialog
+    Buttons = <
+      item
+        Caption = '&Try again'
+        Default = True
+        CommandLinkHint = 'Reload all scripts'
+        ModalResult = 4
+      end
+      item
+        Caption = '&Cancel'
+        CommandLinkHint = 'Exit G940LEDControl'
+        ModalResult = 8
+      end>
+    CommonButtons = []
+    ExpandedText = '<Error message>'
+    Flags = [tfAllowDialogCancellation, tfUseCommandLinks, tfExpandedByDefault]
+    MainIcon = 2
+    RadioButtons = <>
+    Text = '<File name>'
+    Title = 'Script error'
+    Left = 384
+    Top = 376
+  end
 end
diff --git a/G940LEDControl/Forms/MainFrm.pas b/G940LEDControl/Forms/MainFrm.pas
index ec7ae0c..1be8b08 100644
--- a/G940LEDControl/Forms/MainFrm.pas
+++ b/G940LEDControl/Forms/MainFrm.pas
@@ -29,7 +29,7 @@ uses
   LEDStateConsumer,
   Profile,
   ProfileManager,
-  Settings;
+  Settings, Vcl.Dialogs;
 
 
 const
@@ -129,6 +129,7 @@ type
     TrayIcon: TTrayIcon;
     ApplicationEvents: TApplicationEvents;
     cbFSXSEAutoLaunch: TCheckBox;
+    ScriptErrorDialog: TTaskDialog;
 
     procedure FormCreate(Sender: TObject);
     procedure lblLinkLinkClick(Sender: TObject; const Link: string; LinkType: TSysLinkType);
@@ -232,7 +233,6 @@ uses
   System.SysUtils,
   System.Types,
   System.Win.ComObj,
-  Vcl.Dialogs,
   Vcl.Graphics,
   Winapi.ShellAPI,
 
@@ -254,6 +254,7 @@ uses
   G940LEDStateConsumer,
   LEDColorIntf,
   LEDFunctionIntf,
+  LuaLEDFunctionProvider,
   StaticLEDFunction,
   StaticResources;
 
@@ -313,6 +314,7 @@ procedure TMainForm.FormCreate(Sender: TObject);
 var
   worker: IOmniWorker;
   scriptPaths: TStringDynArray;
+  provider: ILEDFunctionProvider;
 
 begin
   FLog := TX2GlobalLog.Category('UI');
@@ -341,8 +343,29 @@ begin
     scriptPaths[2] := TPath.GetFullPath(App.Path + '..\' + FSXScriptsPath);
   end;
 
-  FunctionRegistry.Register(TFSXLEDFunctionProvider.Create(scriptPaths));
+  while True do
+  begin
+    try
+      provider := TFSXLEDFunctionProvider.Create(scriptPaths);
+      Break;
+    except
+      on E:ELuaScriptLoadError do
+      begin
+        ScriptErrorDialog.Caption := Self.Caption;
+        ScriptErrorDialog.Text := Format('One or more errors occured while trying to load "%s"', [E.Filename]);
+        ScriptErrorDialog.ExpandedText := E.Message;
+        ScriptErrorDialog.Execute;
 
+        if ScriptErrorDialog.ModalResult = mrClose then
+        begin
+          Application.Terminate;
+          Exit;
+        end;
+      end;
+    end;
+  end;
+
+  FunctionRegistry.Register(provider);
 
   FEventMonitor := TOmniEventMonitor.Create(Self);
 
diff --git a/G940LEDControl/Scripts/FSX/systems.lua b/G940LEDControl/Scripts/FSX/systems.lua
index 9b202d4..0d4b623 100644
--- a/G940LEDControl/Scripts/FSX/systems.lua
+++ b/G940LEDControl/Scripts/FSX/systems.lua
@@ -131,10 +131,10 @@ RegisterFunction(
     displayName = 'Auto brake',
     states = {
       ['0'] = { displayName = 'Off / not available', default = LEDColor.Green, order = 1 },
-      ['1'] = { displayName = '1', default =  LEDColor.Amber, order = 2 },
-      ['2'] = { displayName = '2', default =  LEDColor.Amber, order = 3 },
-      ['3'] = { displayName = '3', default =  LEDColor.Amber, order = 4 },
-      ['4'] = { displayName = '4', default =  LEDColor.Red, order = 5 }
+      ['1'] = { displayName = '1', default = LEDColor.Amber, order = 2 },
+      ['2'] = { displayName = '2', default = LEDColor.Amber, order = 3 },
+      ['3'] = { displayName = '3', default = LEDColor.Amber, order = 4 },
+      ['4'] = { displayName = '4', default = LEDColor.Red, order = 5 }
     }
   },
   function(context)
@@ -167,7 +167,136 @@ basefunctions.RegisterOnOffFunction({
 
 
 -- Tail hook
+RegisterFunction(
+  {
+    uid = 'tailHook',
+    category = strings.Category.FSX.Systems,
+    displayName = 'Tail hook',
+    states = {
+      retracted = { displayName = 'Retracted', default = LEDColor.Green, order = 1 },
+      between = { displayName = 'Extending / retracting', default = LEDColor.Amber, order = 2 },
+      extended = { displayName = 'Extended', default = LEDColor.Red, order = 3 }
+    }
+  },
+  function(context)
+    SetState(context, 'retracted')
+
+    OnSimConnect(context,
+      {
+        position = { variable = 'TAILHOOK POSITION', type = SimConnectDataType.Float64, units = 'percent' }
+      },
+      function(context, data)
+        if data.position >= 0 and data.position <= 5 then
+          SetState(context, 'retracted')
+        elseif data.position >= 95 and data.position <= 100 then
+          SetState(context, 'extended')
+        else
+          SetState(context, 'between')
+        end
+      end)
+  end
+)
+
+
 -- Tail wheel lock
+basefunctions.RegisterOnOffFunction({
+  category = strings.Category.FSX.Systems,
+  uid = 'tailWheelLock',
+  displayName = 'Tail wheel lock',
+  variable = 'TAILWHEEL LOCK ON'
+})
+
+
 -- Float (left)
--- Float (right)
--- Fuel level
\ No newline at end of file
+local function RegisterFloatFunction(functionUid, functionDisplayName, variableName)
+  RegisterFunction(
+    {
+      uid = functionUid,
+      category = strings.Category.FSX.Systems,
+      displayName = functionDisplayName,
+      states = {
+        retracted = { displayName = 'Retracted', default = LEDColor.Red, order = 1 },
+        between = { displayName = 'Extending / retracting', default = LEDColor.Amber, order = 2 },
+        extended = { displayName = 'Extended', default = LEDColor.Green, order = 3 }
+      }
+    },
+    function(context)
+      SetState(context, 'retracted')
+
+      OnSimConnect(context,
+        {
+          position = { variable = variableName, type = SimConnectDataType.Float64, units = 'percent' }
+        },
+        function(context, data)
+          if data.position >= 0 and data.position <= 5 then
+            SetState(context, 'retracted')
+          elseif data.position >= 95 and data.position <= 100 then
+            SetState(context, 'extended')
+          else
+            SetState(context, 'between')
+          end
+        end)
+    end
+  )
+end
+
+RegisterFloatFunction('floatLeft', 'Float (left)', 'RETRACT LEFT FLOAT EXTENDED')
+RegisterFloatFunction('floatRight', 'Float (right)', 'RETRACT RIGHT FLOAT EXTENDED')
+
+
+-- Fuel level
+RegisterFunction(
+  {
+    uid = 'fuelLevel',
+    category = strings.Category.FSX.Systems,
+    displayName = 'Fuel level',
+    states = {
+      ['notAvailable'] = { displayName = 'Not available', default = LEDColor.Off, order = 1 },
+      ['empty'] = { displayName = 'Empty', default = LEDColor.FlashingRedFast, order = 2 },
+      ['0To1'] = { displayName = '< 1%', default = LEDColor.FlashingRedNormal, order = 3 },
+      ['1To2'] = { displayName = '< 2%', default = LEDColor.FlashingRedNormal, order = 4 },
+      ['2To5'] = { displayName = '< 5%', default = LEDColor.Red, order = 5 },
+      ['5To10'] = { displayName = '< 10%', default = LEDColor.Amber, order = 6 },
+      ['10To20'] = { displayName = '< 20%', default = LEDColor.Amber, order = 7 },
+      ['20To50'] = { displayName = '< 50%', default = LEDColor.Green, order = 8 },
+      ['50To75'] = { displayName = '< 75%', default = LEDColor.Green, order = 9 },
+      ['75To100'] = { displayName = '75% - Full', default = LEDColor.Green, order = 10 }
+    }
+  },
+  function(context)
+    SetState(context, '75To100')
+
+    OnSimConnect(context,
+      {
+        capacity = { variable = 'FUEL TOTAL CAPACITY', type = SimConnectDataType.Float64, units = 'number' },
+        quantity = { variable = 'FUEL TOTAL QUANTITY', type = SimConnectDataType.Float64, units = 'number' }
+      },
+      function(context, data)
+        if data.capacity > 0 then
+          local percentage = math.ceil(data.quantity / data.capacity * 100)
+
+          if percentage == 0 then
+            SetState(context, 'empty')
+          elseif percentage == 1 then
+            SetState(context, '0To1')
+          elseif percentage == 2 then
+            SetState(context, '1To2')
+          elseif percentage >= 3 and percentage <= 5 then
+            SetState(context, '2To5')
+          elseif percentage >= 6 and percentage <= 10 then
+            SetState(context, '5To10')
+          elseif percentage >= 11 and percentage <= 20 then
+            SetState(context, '10To20')
+          elseif percentage >= 21 and percentage <= 50 then
+            SetState(context, '20To50')
+          elseif percentage >= 51 and percentage <= 75 then
+            SetState(context, '50To75')
+          else
+            SetState(context, '75To100')
+          end
+        else
+          SetState(context, 'notAvailable')
+        end
+      end)
+  end
+)
\ No newline at end of file
diff --git a/G940LEDControl/Units/LuaLEDFunctionProvider.pas b/G940LEDControl/Units/LuaLEDFunctionProvider.pas
index e711339..1bac8a6 100644
--- a/G940LEDControl/Units/LuaLEDFunctionProvider.pas
+++ b/G940LEDControl/Units/LuaLEDFunctionProvider.pas
@@ -18,6 +18,15 @@ uses
 type
   ELuaScriptError = class(Exception);
 
+  ELuaScriptLoadError = class(ELuaScriptError)
+  private
+    FFilename: string;
+  public
+    constructor Create(const AMessage, AFilename: string);
+
+    property Filename: string read FFilename;
+  end;
+
   TCustomLuaLEDFunctionWorker = class;
 
 
@@ -490,7 +499,7 @@ begin
         Interpreter.LoadFromFile(scriptFile);
       except
         on E:Exception do
-          Exception.RaiseOuterException(ELuaScriptError.CreateFmt('Error while loading script %s: %s', [scriptFile, E.Message]));
+          Exception.RaiseOuterException(ELuaScriptLoadError.Create(E.Message, scriptFile));
       end;
 end;
 
@@ -732,4 +741,12 @@ begin
   FOnTimer();
 end;
 
+{ ELuaScriptLoadError }
+constructor ELuaScriptLoadError.Create(const AMessage, AFilename: string);
+begin
+  inherited Create(AMessage);
+
+  FFilename := AFilename;
+end;
+
 end.