Only Y 2 in 1 Mini RPM Voltmeter Digital Tachometer Voltmeter Minute Digital Voltage Test LED Red for Car Motorcycle Features: ✔ We adopt the 0.36in digital tube, suitable for 12V diesel engines for 1~8 cylinder engines. ✔ Behind the instrument button is the setting of the internal parameters. When you find that the display speed and actual speed are not consistent, then we need to adjust the settings. Long press the button for more than 3 seconds to enter the setting state, short press the selected frequency, long press more than 3 seconds to confirm. ✔ In case of 12V car battery overvoltage or undervoltage, the alarm will flash. When the battery voltage is less than 11V (<11V) or more than 15V (> 15V), the alarm will flicker and display the actual battery voltage. ✔ Black wire: ground wire, connect the negative output of the battery (DC -). Red wire: power supply, connect the positive output of the battery (DC +). Yellow wire: speed signal cable, connected to the ignition outlet or to the trigger lines. ✔ Note: Never connect a single cable to a high voltage power coil output cable. You will burn this automatic car meter!! ! Specifications: Working range: 8 V ~ 17 V. Working current: 40 mA. Voltage accuracy: ± 0.1 V. Rotation accuracy: ± 30 rpm Maximum rotation gauge: 100-31800tr / minute. Bulb colour: red. Package includes: 1 x Speedometer Voltmeter (without retail package)
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