WHDTS Signal Generator 1-Channel 1Hz-150KHz PWM Pulse Frequency Duty Cycle Adjustable Module LCD Display

I have this whdts signal generator its looking like it can't control a pwm coil what is amp rating for this unit? what might i be needing then?

I have an expensive boat tachometer i wish to test. will this generate the proper waveform to simulate an rpm signal from the engine sensor?

Can this be set for fractional frequencies, like 10.5Hz?

Can this be able to put pwm signal bypass radiator fans on a vw mk5 the control module