FUEL GAUGE/SENDER OHM SIGNAL INTERFACE MODULE-BWAFSM01

Make almost any fuel sender work with almost any fuel gauge with our Universal Fuel Sender Interface Module.

Fuel gauges are designed to operate within a specific resistance (Ohm) range, but different vehicle and gauge manufacturers use different ranges. This can create compatibility problems when installing aftermarket gauges, replacing a fuel tank, upgrading a fuel sender, or combining original and aftermarket components.

The BWAFSM01 Fuel Sender Interface Module is designed to solve this problem by acting as an interface between your fuel sender and fuel gauge, allowing senders and gauges with different resistance ranges to operate together.

Match Your Fuel Sender to Your Gauge

The module can work with resistive fuel senders and gauges using resistance ranges from 0 to 5000 Ohms, including many common configurations such as:

10–180Ω • 0–30Ω • 0–90Ω • 240–33Ω • 73–10Ω and more

This means you can retain your original fuel sender with a new aftermarket gauge, or use a replacement sender with your existing fuel gauge.

Key Features

• Universal Fuel Sender to Gauge Interface
• Reads resistive fuel senders from 0–5000Ω
• Works with a wide range of fuel gauges
• Corrects mismatched sender and gauge Ohm ranges
• Helps reduce erratic gauge movement caused by fuel slosh
• Programmable Empty, Half and Full calibration points
• Programmable power-on gauge position
• Microprocessor-controlled operation
• Automatically calculates linear readings between Empty, Half and Full
• Compact design for easy installation
• Suitable for 12V DC automotive applications
• Only 4 wires required for connection

Custom Calibration

Rather than being limited to one predetermined sender range, the module can be programmed specifically for your fuel sender and gauge combination.

The Full, Half and Empty positions can be individually calibrated and stored. Once programmed, the built-in microprocessor calculates the intermediate fuel levels to provide a linear progression between these calibration points.

The gauge's power-on position can also be configured to use either the sender position or a programmed starting position.

Wiring

Specifications

• Part Number: BWAFSM01
• Operating Voltage: 12V DC
• Number of Wires: 4
• Wire Length: Approx. 15cm
• Supported Resistance Range: 0–5000Ω
• Output: NPN pulse-width-modulated (PWM) signal
• Compact module design

Installation & Programming

Mount the module in a clean, dry and cool location, then connect the four wires according to the wiring guide.

Using Store Mode, program and save the Full, Half and Empty fuel levels along with the required power-on position. The power-on mode can then be configured to determine how the gauge behaves when the vehicle is started.

Once calibration is complete, operate the unit in Run Mode and check the gauge throughout its operating range.

Important Installation Notes

For accurate operation, the fuel tank sender must share the same ground/earth as the interface module. An incorrect or poor ground may result in erratic fuel gauge readings.

When making adjustments, move the gauge through its range from Full to Empty to help avoid hysteresis errors. Some fuel gauges respond slowly, so allow sufficient time for the gauge to stabilise before making further adjustments.

The module uses an NPN pulse-width-modulated output, which may cause an audible buzzing sound in some undamped fuel gauges.

BWAFSM01 – a practical solution for matching otherwise incompatible fuel senders and fuel gauges.