Good man yourself, thats an excellent idea! I will take a diagram off your hands of thats ok, useful mod. Hit me up on MSN sure!

 

Well done you!!!!

Although I try to have at least a third in there, I had the unfortunate journey of a round trip from Stoke to Birmingham and back on Friday which took me 7 hours!! instead of 2, due to a serious accident and my fuel was so low I had no money, forgot my bank cards.. Mobile had a flat battery and frankly I was crapping it!

Something like this would of been a god send if nothing more than to keep my marbles as I was staring into the rear of a lorry for 4 hours!!!

Any diagrams would be greatly received!! send an email to my user name with gmail.com on the end

Once again, well done!!!!

Sean

 

Yes please, count me in. I would love a wiring diagram or if you want to send me a complete unit, excellent idea. Why hasn't someone thought of this before?

Please let me know. :URGOD:

 

Ahh very smart

I'll have the diagram cheers mate!

Need to pop into the uni to shop for some components

Cheers!

 

great job Paul!!!!! well done!!! i could definately use one of those.. i ve run out of fuel quite a few times
well done!!!!

 

Faulty fuel gauge? if not, then if its reading low, you need fuel....go fill-up

 

Trying to do a diagram with Smartdraw, getting annoyed with it!! :taz:

 

This idea would be good for keeping track on your MPG as if the light comes on with approx the same amount in each time, then you can keep track and get more accurate figures.

Plus, it's another gimmick that's just cool, so count me in please

 

Well done mate I was just thinking the other day if this could be done. I found out that the resistance at the guage changes to show the fuel amount. I see there are 5 wires. is that 2 for power 1 to the guage and 2 for the led?

Please could I also have a copy of the diagram

Thanks cju

 

This would be absolutely brilliant! Not too good with wiring diagrams, is a tutorial going to be included with the wiring diagram?
Cheers!!

Cant wait to do this

 

Here is the circuit diagram for the Low Fuel light.
There should be no problems obtaining any of the components used, it's built on a small piece of 0.1 matrix board.

I can supply the finished circuit including a tutorial for £16 including postage and the installation guide if anyone doesn't fancy soldering it up themselves.


*** Error in diagram*** Pin 4 of the IC should also be connected to ground.

 

Finished circuit....



Hello,
M new here but m desperate for this circuit thing how do I get it? Help

 

PM sent Paul, Looks like there is gona be a demand so I will take a finshed unit off your hands!

 

Is it possible to post the tutorial for free and let those who want to buy a finished one off you pay £10? Cos I would like an attempt to try making it myself if I could. Most probably I would mess it up and buy one in the end anyway...but I would still like a go

 

Sorry, the tutorial I did covers removing the instruments, fitting the pcb and wiring it up.

I didn't do a tutorial on building the circuit itself.

 

Any possibility you could post the components used as they appear on the wiring diagram, and maybe how to wire it up? The picture of the diagram isn't crystal clear so i'm not sure of the components used and where they connect to the instruments.

Pretty please...:cloud9:

 

Looks good, but how easy is it to do for a novice DIY person, and do you need any special tools? Approx time to fit etc would be welcomed. Good work though!

 

The components used are as follows...

Semiconductors;
LM311N comparator.
78L10 voltage regulator.
4.3v 500mW zener diode.
Red LED to suit.
Resistors;
22k 0.25w
4.7k 0.25w
1.8k 0.25w
Capacitors;
1000uF 10v
100uF 16v
47nF 63v


Various lengths of wire, piece of stripboard 11 holes by 11 tracks, solder and soldering iron, heatshrink sleeving and double sided sticky pads.

 

Paul I just want to know how you deduced at what voltage there was 5 litres left?

 

Take note: Definitely is not Definately, Yours is not Your's, Theirs is not Theres, Brakes is not Breaks, Wondered is not Wandered and there is no such thing as Bumbers.....

where is not were, advise is not advice
hehehe they just popped in to my head[/quote]

 

I emptied the tank and put back 5 litres!

 

LOl.....seems fair emough. You have too much time on your hands.:lol:

 

Thanks for the list Technozen, unfortunately i think i may be over my head. I can see what part is what on the wiring diagram, but i just can't seem to work out exactly how it is wired up. I think i will have to have a ready made unit and follow your instruction guide.

Please let me know any details.

Thanks

 

Dude that would have made a great project, wish I'd thought of that. Sadly I don't have the confidence to take my dash apart. Big mechanical things I think I could handle, not delicate little dials. That said, my soldering and PCB skills are ok.

 

Will this work on a ZR mk2? Also is 5 litres remaining the standard amount of fuel left for most cars when the light comes on?

 

Should work, I assume the tank sender and gauge are the same.

I just chose 5 litres, any less and I was afraid that crud could be sucked into the pump and fuel system.

The circuit can be adapted for higher volumes, 10 litres equates to 3.9 volts, simply change the zener diode to a 3.9v component.

 

Received the ready made unit from Technozen today, thanks by the way . Very good instructions and made very well. Very easy mod todo as there is no wire cutting/splicing. The only worrying bit to do is to drill through the guage itself to fit the led.

One problem i did find though which i have sorted, was that when you put the headlights on the dash lights show through the led as there is a see through bit at the back of the led which you don't see which allows the light through. To stop this i surrounded the end of the led in insulating tape and made it a tight fit up against the back of the guage, thus stopping the light to shine through the led.

One question though as i was putting it all back together, i realised that the needle had moved slightly as it wasn't on what is was before taking apart. Will the guage return back to normal when running? Can't start the car at the mo, but this is a long story.

Thanks for that Technozen, great job.

P.S. What was that circuit you mentioned in the thread 'Electrical Question' about making the indicators flash twice instead of once?

 

Glad it arrived, didn't spot the "shine through" on mine.

The needle will return to the correct position once the ignition is turned on.

 

can this be done for a rover 25 2004 model?

 

Yep, and I'm going to (attempt to) do it to my ZR!!!

Paul, you are actually a genius mate.