THERE IS NO PRESSURE TUBE CONNECTION. A GPS IS BUILT IN TO THIS SPEEDOMETER. DO NOT CONNECT IT TO ANOTHER GPS. THERE IS A GPS INSIDE THIS SPEEDOMETER.
How to change the settings (12/24 hour time, time zone, speed/distance, and fuel sender) on my EmTac Speedometer
To change settings simultaneously hold the set and mode buttons until the display changes (should take 4-5 seconds). This will enter you into the setup menu.
In the setup menu, short press the set button to move between time mode, time zone, units, and fuel mode settings which will be indicated by 1, 2, 3, or 4 on the trip display respectively.
Short press the mode button to select options within each of the four menus which will be displayed on the speed display.
The options for time mode (1 on the trip display) being 12 or 24 hour time. For time zone (2 on the trip display) the number displayed on the speed diplay is the number of hours added to GMT. For 12 hour time that does not distiguish between AM and PM you may select 7 as the offset for eastern time or 6 during daylight savings. For speed units (3 on the trip display) the options are knots, miles per hour, and kilometers per hour which will be indicated on the screen by their respective icon. For fuel mode (4 on the trip display) the speed display will show US for US fuel senders/tanks, EU for European fuel senders/tanks, and YA for Yamaha fuel senders/tanks.
To save and exit settings, once again simultaneously press and hold the set and mode button until the display changes.
How to change/use the trip display
The mode button allows the user to scroll through the following options on the hours display: trip distance, time, current voltage, course over ground and no display.
Only on the trip distance display can the distance be reset to zero by pressing the set button.
General Wiring
Red: +12V GPS backup power (NOT switched power)
Yellow: +12V switched key power
Blue: +12V backlight power
Black: GND
Black-White: GND for fuel sender/tank
Gray: Fuel sender/tank signal (this may have been white on your old gauge)
Red-White: GPS NMEA 0183+ output THIS IS AN OUTPUT DO NOT CONNECT THIS TO POWER OR ANOTHER GPS. IF YOU ARE UNSURE IF YOU NEED THIS THEN LEAVE IT DISCONNECTED. IT IS NOT NEEDED FOR THE SPEEDO TO WORK
Blue-White: GPS NMEA 0183- output THIS IS AN OUTPUT DO NOT CONNECT THIS TO POWER OR ANOTHER GPS. IF YOU ARE UNSURE IF YOU NEED THIS THEN LEAVE IT DISCONNECTED. IT IS NOT NEEDED FOR THE SPEEDO TO WORK
Common Issues and FAQs:
What hole size is required for installation?
A 3-3/8" hole is used for installation.
The gauge takes a long time to acquire GPS/display speed:
While the GPS works to acquire a signal the speed will flash 00, this will stop flashing and display the speed once signal is acquired. GPS signal is required to display time and course over ground as well. It is normal for the speedometer to take upwards of 10 minutes to acquire GPS singal on the first time powering up but if installed correctly then it should take less than 5 seconds for every use thereafter. The red wire must be connected to constant +12V for the GPS to quickly acquire signal. If the gauge does not acquire signal try switching it off and on again and wait 10 minutes.
If the problem still persists and all wiring is correct this likely means there is a bad connection with either black (GND) or red (+12V) such that the starting voltage drops too low at the gauge.
My fuel level is not reading correctly
There are many things that can cause this issue, the most common issues and fixes are as follows
- You have not input the correct setting for the fuel sender in your boat. The default setting is for a standard US 33-240 ohm sender. Try a different setting.
- The fuel sender is not grounded directly to the speedometer. While technically speaking you should be able to ground your sender wherever ground may be this is prone to cause errors, best practice is for the sender to be grounded at the black/white wire on the speedo.
- Bad fuel senders are also a possibility, and they frequently do go bad. Odds are if you are replacing your gauge then its time you should replace your sender as well. A multimeter can be used to test your sender, test resistance where the wires connect to the gauge.
- Bad wiring to the fuel sender is also very possible. If your fuel level always read a little low before then this is your culprit. This should also be replaced any time you replace your fuel sender.
- Low voltage at the speedometer can also cause incorrect readings. The speedometer only needs about 3 volts to turn on but requires at least 10 for things to work normally. The speedometer has a built in voltage display, check what this reads and compare it with a multimeter at the battery. The speedo is expected to read about 0.3 volts less than the battery. If you have low voltage check the yellow and black wires that power the speedo.
How to wire your speedometer to your yamaha fuel management gauge and other electronics
THE YAMAHA FUEL MANAGEMENT GAUGE IS A SEPARATE AND DIFFERENT GAUGE THAN THE SPEEDOMETER. STOP READING HERE IF YOU DO NOT HAVE A FUEL MANAGMENT GAUGE.
The speedometer acts as a GPS unit/antenna for the fuel managment gauge with NMEA 0183 output. Red with white stripe is NMEA 0183 + while blue with white stripe is -. Spare bullet connectors are included with the speedometer to either connect the appropriate signal lead that matches your fuel management gauge or wire straight to the fuel managment gauge.
The fuel management gauge will have a 4 pin connector for speed/GPS input. See below labeled B. 3 wires are in this connector, red (R), white (W), and black (B). The white wire from this connector needs to be connected to NMEA 0183 + from the speedometer (red with white stripe). Do not connect anything to the black or red wires.
Adjust the dip switches in your fuel management gauge to change the input from speedometer to GPS. Please refer to the manual for your gauge for appropriate dip switch positions.
For other electronics follow the manufacturer's instructions on connecting a NMEA 0183 GPS antenna.