Gauge Demo 

unit Gauge;
interface
uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Gauges, ExtCtrls, StdCtrls;
type
  TForm1 = class(TForm)
    Timer1: TTimer;
    Gauge1: TGauge;
    Button1: TButton;
    procedure Timer1Timer(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Timer1Timer(Sender: TObject);
begin
 Gauge1.Progress := Gauge1.Progress + 1;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
 Timer1.Enabled := True;
end;
end.