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Connecting VB3i to a Gregory Fuel Flow Sensor

Updated on Mar 4, 2026

If you are intending to connect a Gregory Fuel Flow Sensor to a VBOX 3i, there are two options available; you can either connect the sensor to a modified Frequency Input Module, or connect the sensor to a Mini Input Module and VBOX 3i.


IMPORTANT - If you are intending to use a Frequency Input Module, a standard unit cannot be used! Please confirm that you will be using the FIM03 with a Gregory Fuel Flow Sensor when ordering to ensure the unit is modified correctly.

Modified Frequency Input Module Connection #

Gregory Fuel Flow Sensor 1
Gregory Fuel Flow Sensor 2
Gregory Fuel Flow Sensor 1
Gregory Fuel Flow Sensor 2
  1. Using a BNC to BNC connection cable, connect the 'TTL OUT' port of the Gregory Fuel Flow Sensor to the 'CH1' port of the Frequency Input Module.
     
  2. Using a BNC to BNC connection cable, connect the 'ANA OUT' port of the Gregory Fuel Flow Sensor to the 'CH3' port of the Frequency Input Module.
     
  3. Using a RLCAB005 cable, connect the 'CAN' port of the VBOX 3i to socket '1 (CAN/POWER IN)' or '2 (CAN OUT)' of the Frequency Input Module.
     
  4. Using a RLCAB066-2 cable, connect the 'USB' port of the VBOX 3i to a PC USB connection.
     
  5. Apply power to all connected units.
     
  6. Using VBOX Setup, navigate to 'Channels', then 'FIM03' and configure Channels 1 and 3 for Fuel Flow Modes (substituting Channel 2 in the instructions for Channel 1).
     
  7. Ensure the 'Pulses / cc' additional property matches the TTL scale on the Gregory Fuel Flow Sensor.
     
Gregory Fuel Flow Sensor 3

Mini Input Module Connection #

Gregory Fuel Flow Sensor 4
Gregory Fuel Flow Sensor 5
Gregory Fuel Flow Sensor 4
Gregory Fuel Flow Sensor 5
  1. Using a BNC to dual crocodile clips connection cable, connect the 'TTL OUT' port of the Gregory Fuel Flow Sensor to the Mini Input Module.
    • Connect the red crocodile clip to the 'DIGIN1' port of the screw terminal via a single wire connection.
    • Connect the black crocodile clip to the 'GND' port of the screw terminal via a single wire connection.
       
  2. Using a BNC to dual crocodile clips connection cable, connect the 'ANA OUT' port of the Gregory Fuel Flow Sensor to the VBOX 3i.
    • Connect the red crocodile clip to the 'A IN PIN 1' port of the screw terminal (ADC25IPCON) via a single wire connection.
    • Connect the black crocodile clip to the 'A IN PIN 17' port of the screw terminal (ADC25IPCON) via a single wire connection.
       
  3. Using a RLCAB005 cable, connect the 'CAN' port of the VBOX 3i to socket 'DATA1' of the Mini Input Module.
     
  4. Using a RLCAB066-2 cable, connect the 'USB' port of the VBOX 3i to a PC USB connection.
     
  5. Apply power to all connected units.
     
  6. Using VBOX Setup, navigate to 'Channels' and configure the 'Freq_Tag' channel within 'Input Modules' as below.
Gregory Fuel Flow Sensor 6