Placement on Vehicle:tCountry/Region of Manufacture:chinaSpecial Features:GPS Speed meterBrand Name:ZMFJHOrigin:Mainland ChinaMaterial:Stainless Steel & PlasticOther Part Number:GPS SpeedometerManufacturer Part Number:Tachometer RPMWorking Voltage:12V/24VFuntion:IP67 WaterproofCar speed meter:digital car speedometergps speedometer:boat speedometer,gps speedometer motorcyclemotorcycle gps speedometer:speed metersmotorcycle gps counter:speedometergps speedometer boat:boat speedometermotorcycle speedometer gps:speed metersMy friend, there are multiple products to choose from in the link. Please choose the product you need based on the picture. If you place an order incorrectly, you will need to bear the after-sales problem yourself. Thank you for your understanding and support Specifications: GPS Speed Sender (Mini Size, Universal Type) Application: AlI kinds of Speedometer, Tachograph High Accuracy only 0. 2% deviation (mechanical speed sensor will be 3~5% deviation) Anti-GPS Stationary Drift technology. Support both Negative & Positive Pulse output with Max 50,000pules/km suitable for different gauges with programmable speed ratio and lowest 0.5km/h speed to start. Output two speed signals which are reverse Shockproof and Circuit Protection design Pulse/Odometer Compensation when in Tunnel or under Bridge Default Speed Ratio: 5000ppk (5000 pulses per km) High quality GPS Active Antenna which performs well in windy or heavy rainy weather. Mini Size: 4. 5cm(L)x1.9cm(W), 100cm extended cable DC12V/24V Power Supply (6- 36V DC) Cable Definition: - RED: Power +, DC8~32V - BLACK: GROUND - GREEN: Speed Pulse Signal Output + - BIUE: Speed Pulse Signal Output- Please connect GREEN or BLUE cable (one of the two) to your current Speedometer/odometer/tachograph. How does it work? GPS Odometer Speed Sender provides a reliable calibration-free replacement for mechanical speed senders. Using data received from the Global Positioning Satellite network, the GPS Speed Sender calculates three-dimensional ground speed and provides a pulsed output suitable for existing mechanical speed senders. This high-technology solution eradicates the dependency on vehicle specific parameters thereby reducing installation time and eradicating the need for periodic calibration.