A system and method for monitoring for a specified frequency band is disclosed. In a preferred embodiment according to the invention, the LED includes a crystalline semiconductor chip serving as the light emitting component. A method of testing a fuel system of the motorcycle involves connecting the pressure tester to the fuel tank by connecting the male tester fitting with the fuel tank female fitting, and connecting the female tester fitting with the fuel line male fitting, energizing the in-tank fuel sending unit, and reading pressure within the tester indicated by the pressure gauge. installing the net cloth: cutting out the net cloth according to the size of the inner border, impacting the edge of the net cloth into the inner border by the gun screw by hand, and then cutting redundant net cloth; d.