Quote:
Originally Posted by Proteus
........... Can the signal from the fuel gauge be used to trigger a low fuel light? I'd imagine that it's just sending variable voltage to the gauge, so maybe with a resistor it could trip the light at the correct voltage?
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Using the original sending unit, you will need some electronic brain to recognize specific Amps (yes, voltage remains the same while current changes with fuel level) and to command the light.
The simplest way is replacing the sending unit with a switch, but then, you introduce a spark inside the gas tank:
no good.
Take a look at this:
http://auto.howstuffworks.com/fuel-gauge.htm