[Dark_Kostas]

Using this function
https://sampwiki.blast.hk/wiki/SetVehicleNumberPlate

As the vehicle has to be respawned you can use something like

pawn Код:

new bool:IsVehiclePlateOk[MAX_VEHICLES];

OnVehicleSpawn(vehicleid)
{
    if(!IsVehiclePlateOk[vehicleid])
    {
        IsVehiclePlateOk[vehicleid] = true;
        SetVehicleNumberPlate(vehicleid, "Monster-Game");
        SetVehicleToRespawn(vehicleid);
    }
    return 1;
}