supb 2 in 1 มาตรวัดรอบเครื่องยนต์ดิจิตอล rpm มีไฟ led สําหรับรถยนต์

100% brand new and high quality
Features:
we adopt 0.36in digital tube suitable for 1~8 cylinder autos and motors 12V diesel engine.
Our products are with shells and shine brighter.
Display battery voltage before and afrer engine start
When 12V car battery over voltage (overvoltage) or undervoltage it will be flashing alarm.
When battery voltage is less than 11V (< 11V ) or hgiher than 15V (>15V) it will flickering alarm and display the real battery voltage.

Specification:
Working Voaltage: 8v~17v
Working Current: 40mA
Voltage Accuracy: ±0.1V；
Rotating Accuracy: ±30round/min
Maximym Rotating Gauge: 100-31800round/min
Bulb Color: Red
Quantity: 1 Pc
Other Fixtures:
1. This Auto car RPM meter 2 in 1 function meter use Ultra bright 0.36 inch digital tube digital display instrument driven by high performance mcu. Can be used in automobile motorcycle and other electronic ignition vehicles. Using high integrated design the size and appearance of the same size as the single function of tachometer.

2. Behind the instrument button is for adjusting internal parameters when it is discovered that the display speed and actual speed inconsistency then we need to adjust the parameters (motorcycle idle 1100-1600 idling 750-1200 engine idling in the just started on the high side hot car stability decreased such as air conditioning load change will influence idle).
Parameters depending on the type of engine distribution and wiring position are concerned specifically according to the parameters in more detail below as a reference. The parameter mismatch phenomenon is displayed and the speed of the actual difference are integer times or several times. This reset the normal parameters on it.

Installation guide :
1.1 Please connect Red and Black wire in advanced to make sure display is normal to work then you connect other wire. Attention!
1.2 The speed signal from the engine ignition signal can have many wire connections
1.2.1 . Electronic tachometer wire (some car models have a on special wire for speed if connect will have the best quality signal)
1.2.2 The high voltage ignition coil inlet wire (if car have no special speed line we advise connected here)
1.2.3 Ignition outlet wire
1.2.4 The ignition trigger inlet line
1.2.5 The trigger coil outlet

Very import Attention!!!
Never connect singal cable to high voltage of high voltage ignition coil outlet wire. You will burn this auto car meter!!!
Note:
1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.
2.Due to the difference between different monitors the picture may not reflect the actual color of the item. Thank you!

Package includes:
1 x Tachometer Voltmeter(without retail package)