KERS for all vehicles sourcecode

using GTA;
using GTA.Math;
using GTA.Native;
using System;
using System.IO;
using System.Windows.Forms;



public class KERS : Script
{
    string ScriptName = "KERS for all cars";
    string ScriptVer = "1.0";
    float KERSEnergy;
    int GameTimeRef = Game.GameTime;
    bool BoostActive=false;
    bool KERSNotified = false;
    public KERS()
    {
        Tick += OnTick;

    }
    public static float ForwardSpeed(Entity ent)
    {
        return Function.Call<Vector3>(Hash.GET_ENTITY_SPEED_VECTOR, ent, true).Y;
    }
    void OnTick(object sender, EventArgs e)
    {
        if (CanWeUse(Game.Player.Character.CurrentVehicle))
        {
            Vehicle veh = Game.Player.Character.CurrentVehicle;
            if (BoostActive)
            {
                veh.EngineTorqueMultiplier = 4;
                if (KERSEnergy>0)
                {
                    KERSEnergy--;
                }
                else
                {
                    DisplayHelpTextThisFrame("~b~KERS~w~ discharged.");
                    BoostActive = false;
                }
            }
            if (veh.GetMod(VehicleMod.Engine) > 2)
            {
                if (!KERSNotified)
                {
                    DisplayHelpTextThisFrame("~b~KERS~w~ is available for this vehicle.");
                    KERSNotified = true;
                }

                if (Game.IsControlPressed(2,GTA.Control.VehicleBrake) && !Game.IsControlPressed(2,GTA.Control.VehicleAccelerate) && veh.IsOnAllWheels && ForwardSpeed(veh)>5)
                {
                    if(KERSEnergy<100) KERSEnergy++;
                }
                if(Game.IsControlJustReleased(2,GTA.Control.VehicleBrake))
                {
                    if(KERSEnergy<100) DisplayHelpTextThisFrame("~b~KERS~w~ charged [" + Math.Round(KERSEnergy, 0).ToString() + "%].");
                    else DisplayHelpTextThisFrame("~b~KERS~w~ charged [~g~" + Math.Round(KERSEnergy, 0).ToString() + "%~w~].~n~Press ~INPUT_CONTEXT~ to release it.");

                }
                if (KERSEnergy>0 && Game.IsControlJustPressed(2, GTA.Control.VehicleHorn))
                {
                    DisplayHelpTextThisFrame("~b~KERS~w~ injected.");
                    BoostActive = true;
                }
            }
        }
        else
        {
            if (KERSNotified) KERSNotified = false;
            if (KERSEnergy!=0) KERSEnergy = 0;
            if (BoostActive) BoostActive = false;
        }
    }
    bool CanWeUse(Entity entity)
    {
        return entity != null && entity.Exists();
    }

    void DisplayHelpTextThisFrame(string text)
    {
        Function.Call(Hash._SET_TEXT_COMPONENT_FORMAT, "STRING");
        Function.Call(Hash._ADD_TEXT_COMPONENT_STRING, text);
        Function.Call(Hash._DISPLAY_HELP_TEXT_FROM_STRING_LABEL, 0, false, true, -1);
    }
}