I don't have a 2000 monitor book, but the 100 monitor has a hi-lo switch for 16-145 or 2-16 seeds per second. The tuning knob sets the alarm point. On 'low', set the knob completely counter clock wise. Turn th power on, begin planting and maintain correct speed- all lamps should be off. Turn the knob clockwise untill all lamps are on. Slowly, turn the knob until the lights just go off. Turn it one extra full division. All lamps should go off about the same time. If one or more tune out considerably down the scale, check that unit for a malfunction.
If you can't get the lights turned on in the full clockwise position, set the rate switch in 'hi', and repeat the last set with the knob. Once the monitor is tuned, if seed flow in any unit drops,the row light will lite, and the audible alarm should sound.
Any change in ground speed may require re-tuning.