The speed display of the gas fan fluctuates too much

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Today, the company conducted a test run on the standby gas fan. From 8:00 p.m. to 10:30 p.m., the fan operated at low speeds of 1,000–2,500 revolutions per minute, and the speed gauge showed significant fluctuations; these fluctuations ranged from 100 to 500. The mechanical and electrical teams ruled out the possibility of motor vibration, as observations on site indicated that the fan was running smoothly without any vibrations. Three instrument technicians came in a row and couldn’t fix it. Later, after a series of personnel such as the factory manager, the mechanical supervisor, the instrument specialist, and the process specialist arrived, the instrument inspector made slight adjustments to the height of the transmission probe; there was some improvement, but the problem was not resolved. When the fan speed rises to 4,000 revolutions per minute, the fluctuation increases to around 50 revolutions per minute. I’m asking here whether there are experts who can analyze the reasons for the large fluctuations in rotational speed performance. Thank you.