The SN20 is a low pass filter. This filter allows signals of valid tachometer frequencies to pass through to the gauge while blocking high frequency interference. This filter would be helpful if you have interference on the tachometer’s signal which is causing erratic behavior on your tachometer.
WARNING: This product can expose you to Lead which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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