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  1. Calabashmc

    Volts to ohms for fuel sender

    Can you draw a diagram of this for me? I'll do it but need to know the bits to buy and how to put it together.
  2. Calabashmc

    Volts to ohms for fuel sender

    No, sorry I got that arse about in my earlier post. Lower Ω means fuller tank. Sorry for the confusion.
  3. Calabashmc

    Volts to ohms for fuel sender

    Alec_t I don't know what you mean. 6 bars indicates full tank not empty. With 10Ω resistor I get full tank which makes sense as the old style fuel level sensor being a resistive stick and ball would have higher resistance the emptier the tank. So to reiterate, my fuel level sensor is sonic...
  4. Calabashmc

    Volts to ohms for fuel sender

    yes more bars = more fuel. The measurements I took may not be super accurate as I only have a cheap multimeter. The manufacturer provided additional info (post #37). Is this now enough information for someone to come up with a solution? I can build it if you provide design and willing to...
  5. Calabashmc

    Volts to ohms for fuel sender

    I contacted the fuel gauge manufacturer and they provided the following: The fuel input is approximately 4.5V through 150 ohm. 73 ohm sender voltage would be 4.5*73/(150+73) = 1.5V 10 ohm sender voltage would be 4.5*10/(150+10) = 0.3V 240 ohm sender voltage would be 4.5*240/(150+240) = 2.8V...
  6. Calabashmc

    Volts to ohms for fuel sender

    I have done some measurements: The fuel gauge outputs 4.9 volts. The setup of the gauge is 100ohms is full tank, 10 ohms empty tank. I had a bunch of resistors which measured resistance with ohm meter then put ammeter in line to measure mA and I got the following: 10Ω 28.6mA 6 bars...
  7. Calabashmc

    Volts to ohms for fuel sender

    Will do - will take me a few days.
  8. Calabashmc

    Volts to ohms for fuel sender

    I'd love to do these suggestions but I am a total newb to electronics. As stated this is my first project. So detailed instructions are much appreciated! I have some MOSFET's, some resistors and an Arduino which I bought because the dude at the electronics shop said that's what I'd need. if...
  9. Calabashmc

    Volts to ohms for fuel sender

    I guess the resistance doesn't need to be that granular. I'm thinking if I could get readings at a full tank then for every 1/8th of a tank until Empty. So 9 resistance settings in total. So I'll just have 9 resistors and 9 MOFSET's. I was wrong when I said 0-90 ohms before, upon reading the...
  10. Calabashmc

    Volts to ohms for fuel sender

    Thanks for the solution hevans1944. I went to a local electronics store today and they said basically the same thing except using an Arduino to do the analog-digital conversion. I bought that with a number of MOSFETs and resistors and a little breadboard to trial getting something happening...
  11. Calabashmc

    Volts to ohms for fuel sender

    I found this - digital potentiometer - sounds like it can do what I need. Thoughts? http://www.instructables.com/id/Digital-Potentiometer-MCP41100-and-Arduino/
  12. Calabashmc

    Volts to ohms for fuel sender

    I do not have a datasheet only the information from the instrument gauge installation manual... FUEL LEVEL GAUGE An optional fuel level gauge is also available. It can be used with a fuel switch (default setting) or fuel sender. The fuel sender can be a 240-33 ohm sender, 73-10 ohm sender...
  13. Calabashmc

    Volts to ohms for fuel sender

    I have a late model Harley Davidson Vrod that uses sonar for fuel level. This sonic fuel level sensor outputs volts 0.9v when full to 3.8V when empty. I want to change my instrument cluster but the one I have needs Ohms (0-90) for the fuel gauge not volts. So I'm wondering if there is a way to...
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