[BLACKFIRE69]

@hitman797, this works fine.

procedure Timer1OnTimer(Sender: TObject);
var
  delta1, delta2, delta3: Single;
  CPUPct, RAMPct, DiskPct: Cardinal;
begin
  CPUPct := CPU.CpuLoad;
  RAMPct := RAM.RamLoad;
  DiskPct := Disk.DiskLoad;

  delta1:=(CPUPct * (360 - 2 * C_ANGLE)) / 100;
  RoundArc.Arc.EndAngle(delta1);
  PctLB.Text(IntToStr(CPUPct));

  delta2:=(RAMPct * (360 - 2 * C_ANGLE)) / 100;
  RoundArc2.Arc.EndAngle(delta2);
  PctLB2.Text(IntToStr(RAMPct));

  delta3:=(DiskPct * (360 - 2 * C_ANGLE)) / 100;
  RoundArc3.Arc.EndAngle(delta3);
  PctLB3.Text(IntToStr(DiskPct));
end;