#include <a_samp>
new Float:X, Float:Y, Float:Z, Float:A;
public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
if(newkeys == KEY_FIRE)
{
GetVehicleVelocity(GetPlayerVehicleID(playerid), X, Y, Z);
SetVehicleVelocity(GetPlayerVehicleID(playerid), X * 2.0, Y * 2.0, Z * 2.0);
}
if(newkeys == KEY_CROUCH)
{
        GetVehicleVelocity(GetPlayerVehicleID(playerid), X, Y, Z);
SetVehicleVelocity(GetPlayerVehicleID(playerid), X, Y, Z + 1);
}
if(newkeys == KEY_SUBMISSION)
{
RepairVehicle(GetPlayerVehicleID(playerid));
}
if(newkeys == KEY_LOOK_LEFT)
{
                GetVehiclePos(GetPlayerVehicleID(playerid), X, Y, Z);
GetVehicleZAngle(GetPlayerVehicleID(playerid), A);
SetVehiclePos(GetPlayerVehicleID(playerid), X, Y, Z+1);
SetVehicleZAngle(GetPlayerVehicleID(playerid), A);
}
return 1;
}

OnPlayerUpdate
if(!IsPlayerNPC(playerid) && IsPlayerInAnyVehicle(playerid))
{
if(PlayerInfo[playerid][speedo] == 1)
{
       SSpeedo(playerid);
    }
}

public SSpeedo(playerid)
{
if(IsPlayerInAnyVehicle(playerid) && IsPlayerConnected(playerid) && !IsPlayerNPC(playerid))
{
TextDrawHideForPlayer(playerid,TSpeedo[playerid]);
    new string[128];
    format(string,50,\"%.f Km/H\",GetPlayerSpeed(playerid));
TextDrawSetString(TSpeedo[playerid],string);
TextDrawShowForPlayer(playerid,TSpeedo[playerid]);
}
}
public Float:GetPlayerSpeed(playerid)
{
GetVehicleVelocity(GetPlayerVehicleID(playerid), X, Y, Z);
    return (floatsqroot(X * X + Y * Y + Z * Z) * 180);
}