public void onAction(String name, boolean isPressed, float tpf) {
        if (name.equals(this.name+gearUp) && !isPressed){
            for(PropulsionUnit x:propulsionUnits){
                x.getShifter().gearUp();
                
            }
        }
        
        if (name.equals(this.name+gearDown) && !isPressed){
            for(PropulsionUnit x:propulsionUnits){
                x.getShifter().gearDown();
            }
        }
    }