Rajan Wilcox
Wiring two fuel gauges to one tank is a complex process that requires careful consideration of various factors. Some sources suggest that it is possible to wire two fuel gauges to one tank using a DPDT switch, SPDT switch, or a solenoid-operated tank select valve with a double-pole switch. However, it is important to ensure that both gauges are compatible with the sender type and that all cable connections, power, negatives, and sender wires are secure. Additionally, it is crucial to verify each gauge independently to avoid inaccurate readings. In some cases, a dual station sender may be required to achieve correct readings on both gauges. Proper calibration and testing of the sending units are also essential to ensure accurate fuel level measurements.
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What You'll Learn
Using a DPDT switch
Wiring two fuel gauges to one tank can be done using a DPDT switch. This method allows you to switch between the two tanks and get accurate fuel level readings. Here is a step-by-step guide on how to wire two fuel gauges to one tank using a DPDT switch:
Firstly, ensure that both fuel gauges are compatible with the sender type and that all cable connections, power, negatives, and sender wires are secure and functional. Verify each gauge independently with the sender to ensure they are working correctly.
Next, you will need to connect the DPDT switch to the fuel sender units. The DPDT switch will have two poles, each with three connections. One side of the switch will act as SPDT. Connect the sender wire from the gauge to the centre connection on the switch. Then, connect a wire from each sending unit to the side connections on the switch. Ensure that only the "hot" wires from the senders are switched, while the grounds remain constant.
Now, you can connect the DPDT switch to the fuel gauges. Since the DPDT switch provides two separate connections for the fuel sender (ground and signal wire), you can expect consistent readings from both senders. Ensure that the ground wire from the DPDT switch is connected to the ground terminal on the fuel gauge.
Finally, test the setup by filling one tank and observing the readings on the gauges. Flip the DPDT switch to select the corresponding tank and ensure that the gauge accurately reflects the fuel level.
It is important to note that you should label the DPDT switch to indicate which tank is being monitored. This will prevent confusion and ensure you are aware of the fuel levels in the correct tank.
By following these steps, you can successfully wire two fuel gauges to one tank using a DPDT switch, allowing you to monitor the fuel levels in two tanks with a single gauge setup.
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Wiring diagrams for dual tanks
Wiring two fuel gauges to one tank requires a switch to alternate between readings from the two tanks. This can be achieved using a solenoid-operated tank select valve and a double-pole switch, allowing users to switch tanks and gauges simultaneously. However, it is crucial to label the switch to avoid confusion and keep track of the active tank.
For dual fuel tanks with a single gauge, a wiring diagram is necessary to ensure the correct configuration. The diagram should outline the wiring colours and connections to the fuel gauge, sender, and power source. It is important to verify gauge compatibility with the sender type and ensure all cable connections are secure.
In some cases, a single pole double throw switch may be required for dual fuel tank setups. This type of switch allows for the selection of either fuel sender, displaying the corresponding tank's fuel level on the gauge. It is important to note that the switch position can vary, including on-off, on-on, or a three-position configuration.
When troubleshooting dual fuel tank setups with dual gauges, it is essential to check the wiring and connections. Issues with the fuel gauge readings may be related to the wiring configuration, sender units, or a combination of both. Verifying the wiring diagram and testing the senders can help identify and resolve the problem.
For dual fuel tanks with dual gauges, it is important to ensure compatibility between the gauges and the senders. In some cases, a special sender may be required for dual resistive gauges. Additionally, checking the ground wire to the sender and bypassing it if necessary can help address issues with gauge readings.
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Calibrating gauges
Calibrating fuel gauges can be a tricky process. Firstly, it is important to ensure that both gauges are compatible with the sender type and that all cable connections, power, negatives, and sender wires are in good condition.
If you are dealing with dual fuel tanks and a single gauge, you will likely need to use a switch to alternate between readings from the two tanks. This can be a simple manual switch or an electric switch, such as a solenoid-operated tank select valve with a double-pole switch. However, be cautious as it is easy to lose track of which tank you are monitoring, which can lead to unexpected fuel shortages.
To calibrate the gauges, you may need to adjust the fuel gauge sender. This can be done by attaching the probes of a digital multimeter (DMM) to the sender and adjusting the fuel float arm stop tabs until the desired resistance values are achieved. For example, a reading of 20 Ohms on the full side and 222 Ohms on the empty side.
Alternatively, you can use fixed resistors with values of 20 and 222 Ohms, or a variable 1K ohm potentiometer, to calibrate the gauge. Connect one side of the resistor to the gauge tab where the sender sends its signal, and the other end to a ground source, such as the center bolt. Then, apply a 10 VDC source and adjust the calibration until the gauge needle aligns with the full or empty mark.
It is also important to ensure that the sender is calibrated correctly. This can be done by removing the sender when the tank is around 1/4 full and adjusting the sender's variable resistor to the desired values.
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Using a solenoid-operated tank select valve
If you're looking to wire two fuel gauges to one tank, one approach is to use a solenoid-operated tank select valve. This method allows you to switch between the two tanks and ensures that you are drawing fuel from the correct tank.
To set up this system, you will need a solenoid-operated tank select valve, which can be either a three-port or six-port valve, depending on your specific application. The valve will have inlet and outlet ports that connect to the fuel lines from the tanks. You will also need a double-pole switch, which allows you to switch between the tanks and ensures that the correct gauge is activated.
The wiring for this setup can vary depending on the specific components used. In general, the solenoid valve will require power to operate, and the switch will control which tank is selected. The switch will have multiple terminals, including one connected to the dash gauge and others connected to the fuel level sender wires. When you activate the switch, it will send power to the solenoid valve, causing it to switch the fuel lines to the selected tank.
It is important to note that you should ensure all unused ports on the valve are capped to prevent dirt from entering the valve. Additionally, when wiring the system, it is crucial to follow the correct polarity and connections to avoid any issues.
By using a solenoid-operated tank select valve and a double-pole switch, you can effectively wire two fuel gauges to one tank and have the ability to switch between the tanks while ensuring accurate fuel level readings.
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Compatibility of gauges and senders
One user on a forum noted that they had a setup with two gas tanks and one gas gauge, and they wanted to confirm if it was possible to simply add a turn knob between the gauge and both sending units to switch between readings from the two tanks. They mentioned that both tanks used the same brand and style of sending unit, ensuring perfect compatibility with the gauge on their dashboard.
In another instance, a user faced an issue where they had two fuel gauges, one on the flybridge and one in the saloon helm, and they wanted to confirm the correct wiring setup. They described that both gauges had their individual positive and negative feeds, and the sender wire from the tank went first to the saloon helm gauge and then continued to the flybridge helm gauge.
When dealing with dual gauges, it is important to note that a special sender may be required, as mentioned by a user who had a single VDO 4-20mA fuel gauge but dual resistive oil and water gauges. They suggested checking the VDO website for further details.
Additionally, one user encountered a problem where they had dual fuel tanks with a single fuel gauge and wanted to wire both sending units to the gauge without using a switch. They were advised that it is not possible to expect one circuit to monitor two tanks accurately due to the combined resistance of the floats/resistance values, which would result in inaccurate readings.
To address this, another user suggested using a silvertip switch for manual valves or opting for electric switches, which are available for purchase. They also provided a diagram illustrating how to wire a switch to select either fuel sender, allowing the gauge to read the corresponding tank.
In summary, when wiring two fuel gauges to one tank, it is crucial to ensure compatibility between the gauges and senders by verifying connections, power, negatives, and sender wires. Utilizing switches or valves can also help manage multiple tanks and gauges, but it is important to refer to specific vehicle or product manuals for detailed instructions.
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Frequently asked questions
You can wire 2 fuel gauges to one tank by using a switch. This could be a DPDT switch, a solenoid-operated tank select valve and a double-pole switch, or a silvertip switch.
Wiring 2 fuel gauges to one tank can cause confusion over which tank you are looking at. It can also cause issues with the resistance and voltage, resulting in incorrect readings.
You can label the switch for each tank to avoid confusion. For example, label the switch MAIN and AUX so you know which tank you are looking at.
Yes, a switch is generally recommended to avoid confusion and to allow you to select which tank you are drawing fuel from.
The correct wiring depends on the specific setup and components used. It is recommended to refer to wiring diagrams and seek advice from experts or forums for your specific vehicle or boat.
