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Check the listing for details. Tachometer 4 Digital LED Tach RPM Speed Meter With Hall Proximity Switch Sensor. Condition: New. Listed at 10.52 USD. 1 x Hall Proximity Switch Sensor NPN. -Proximity output current: 200mA. -Clear zero: Automatic. -Response frequency: 100HZ. -Sensor wiring: brown-Power+;blue-Power-;black-signal. -Display: Blue&Green 0.56" LED.