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I needed a 5 volt supply for my gauges and a few guys were talking about a low fuel light so I combined the two. This is what I came up with. Its a circuit board with a 5 volt adjustable power supply and adjustable low fuel light.
Its about 2" by 1.5" in size and is desinged to mount in place where the 5 volt CVR (constant voltage regulator) is located. The blue terminal block on the circuit board is the out put for the low fuel light. An LED or low wattage 12 volt light can be connected there.
The yellow wire is used to monitor the fuel level. It connects to the terminal on the back of the fuel gauge that goes to the fuel sending unit (yellow with white stripe). The red and green wire on the circuit board are made to plug into the wires that went to the CVR.
The above picture shows where I mounted the low fuel LED. The low fuel light is adjustable, it can be adjusted to come on at full tank, 1/2 tank, empty or any where in between. No guessing when there is just 4 gallons left in the tank. There is a built in time delay so bumps in the road won't turn on the light but once it turns on it seals itself on.
And here it is after the time delay.
Last edited by wsinsle (4/17/2014 7:21 PM)
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This little jewel is the cats.... Two or three years ago I was working on a 98 Cobra harness for 68Mustang. He asked if I could figure out how to make a sender to make his original LOW FUEL light work. I tried to make a circuit that read the sender resistance and fired a transistor...I was a miserable failure. Then Bob E on here worked on the idea but again, no joy.
Now Walt has done it and it is slick. Since he was kind enough to send me one of the early production models I wired it into my cluster harness and tested it while ringing out my new under dash wiring.
Works just as advertised. The time delay is supposed to be fifty seconds and it is exactly that...which should be long enough to get over any lumps, bumps or small hills when the tank is low but not critical yet.
I haven't mounted the LED yet and was thinking of putting it in the gas gauge dial face. Now I know that will work, thanks Walt.
This is a well made, well thought out unit. Walt had the PC boards made special and does the assembly himself. Wiring it in is a snap even for the electrically challenged. It should be a Godsend for guys with the later cars that came with the warning light but no longer have a useable fuel sender (I understand the NOS senders are pretty pricey if available at all). And for the rest of us, well, it's just one more cool and functional little bell/whistle to add to our car. And you get an adjustable CVR in the deal.
Thank you for your time and talent, Walt, I just love little up-grades like this. Now, if you will just accept my appology for not getting the story and pix done in a timely fashion...all will be well.
See ya in Vandalia Walt...Great job!
BB
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The various talents in this group never cease to amaze me. From panel beating (my fave since it involves a hammer) to wiring, to electronics, to paint, to writing checks, and everything in between.
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Bob your being way to kind. It was really your kind words of encouragement that got me off my a$$ and started working on this. Do to some issues I've been in kind of a funk for way to long. Now its time to get back to the car I haven't hardly touched in over a year.
Be careful getting in to that fuel gauge to mount the LED, I wasn't sure if mine was going to work again. If I was to do it over again I would probablly mount it in the center below the word fuel or where my first mistake was. (If you look close in the picture where the light is off you could see the first place I drilled) This would require cutting away part of the fuel gauge housing, but would keep you away from the interior workings of the gauge.
If there is any interest in these I will put put some together. I was thinking $30 plus shipping for guys on the fourm. Beleive me this is not a for profit thing. I'll can post more info on the swap page.
Thanks again Bob
Last edited by wsinsle (4/18/2014 10:53 AM)
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You could definitely count me in for one.
I thought the Speedhut gauges I ordered had a warning light, but do not.
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Me TOO!!.........cool little gadget......just what I need!!
6sal6
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That is super cool! I would like to get one too!
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For those interested I posted contact info on the swap page.
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