This tacho must be hooked up to the "W" terminal on vehicle alternator. Many diesel engines and most inboard gas boat engine alternator have this connection. It can also be working with speed sensor.
For details, see individual gauge description at link below. If you need other output signals, like 10-180ohms, 0-90ohms ect, Leave me a note. Water Temperature:287.4-22.4ohm, 100-250F. Fuel Level Sender:240-33ohms, 6-1/2. We can DIY the length per your needs, but it will charge you extra funds if you need longer than 6.5inch, Send us a message before you paid. Attention: A minimum 1"clearance must be maintained between the tank bottom and the float retaining collar in a plastic tank and 1/2"clearance in a rigid metal tank. Senders can be used with all gauges brands that have compatible ohms. Water Temperature Sender:287.4-22.4ohms, 100-250F.Oil Pressure Sender:10184ohms, 0-145PSI. 1 Press the Set button (less than 1 second) to change the back light color.
Color in sequence : Red(Default)-Green-Blue-White-Yellow-Kelly-Orange-Purple-Auto Mode. Remarks : When users select the AUTO MODE, the backlight will be off for around two seconds, and switch automatically as above sequence per minute. 2 Hold the MODE button for three seconds for Switch TRIP01 or TRIP02 or COG to display.TRIP 01: (Default) total mileage for one working cycle, data will not be recorded when power off. TRIP 02: total mileage for one working cycle, data will recorded when power off, but, users could hold the set button for 35 seconds to clear. COG 00 : azimuth instantly indicating, data will not be recorded.
Remarks : The unit of trip, total mileage and outta unit of dial are the same. Speedometer 7 color backlights can be switched backlight as shown below is just an example for your reference. (Tacho, fuel, water temp, volt, oil pressure , The backlight color of these 5 watches is red).Payoneer is my best preferred option. All messages be reply within 24hours. Welcome for wholesales trading, thank you!