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Old December 1st, 2014, 07:49 AM   #1
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Replace Fuel Gauge with Fuel Light?

I'm planning on replacing my stock gauges with a Trailtech Vapor. The Vapor takes care of tach, speedometer, and coolant temp. I'm going to get the 022-PDA dashboard holder that gives you 4 indicator lights as well to use for neutral, hi-beam, turn signal, fuel etc.

I'd like to use the fuel light - I know that everyone says to use the trip odometer and I do that as well but I also like having a visual indicator in case I forget to reset the odometer.

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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Old December 1st, 2014, 07:09 PM   #2
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Still can't find anything on this with the Google.
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Old December 1st, 2014, 08:05 PM   #3
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Quote:
Originally Posted by Proteus View Post
........... 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?
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
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Old December 1st, 2014, 08:45 PM   #4
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I know this doesn't answer your question... but.. Just use your odometer.. I go by mine since my fuel gauge is off by a little bit.
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Old December 1st, 2014, 08:52 PM   #5
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I just shake the bike side to side and hear how much gas is sloshing around in there.
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Old December 1st, 2014, 09:04 PM   #6
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I usually just refill every 150 miles.
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Old December 2nd, 2014, 07:42 AM   #7
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I'd still like to have some sort of visual indicator, because I'm forgetful and the TT Vapor dash has spots for four lights and it would just bug the hell out of me to not use all four. @Motofool thanks for the link - there should be a way to trip a light at a certain current. Going to talk to one of my electrician buddies to see if we can figure it out.
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Old December 2nd, 2014, 08:19 AM   #8
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@Proteus, if it's ok for you to translate from german to english then maybe this could give you some idea or maybe even help to find your solution
http://www.tl1000.de/FAQ/umbauten/tankanzeige.html

Good luck
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Old December 2nd, 2014, 08:33 AM   #9
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Nice, thanks! Google translate does some funny stuff with it though:
Note:
"Be sure to position the element eighth Zueineinader. Have fun, when holes are."
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