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Gas guage works. Kinda

super99

super99

Well-known Member
I finally got the guage to work!!! I added extra ground wire to
the sending unit and the guage and finally took the guage out
of the dash and scraped the paint off around the edges of the
hole and shined up the outside of the guage and put it back
in. Turned on the key and the needle moved. Problem now is
that it reads backwards. It has about 3/4 tank of gas and the
guage reads 1/4 full. Thats okay, I cut a stick to carry in the
toolbox. Thanks for all of the help!!!! Chris
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Well, that's progress!

Do you think it's backward or just off? If it's really backward, can the white plastic piece be turned over?

Be interesting to see how it does in real use. It's how it reads when it's near empty that matters.
 
I tried that on the other new sending unit and it didn't change anything. What if I switched the wires on the guage? Or will it only work one way??
 
That's on an Oliver, right? Is there any chance it was built with a generator that was positive ground? If it has been converted to negative ground, I am thinking that could cause the gauge to read backward. I just don't think you can switch the wires on the sender without a short, but it may be possible to switch the wires on the gauge itself and make it read right without creating a short, if the gauge is not grounded in any way.
 
Hmmm, never thought of that, it has a newer alternator on it, not sure what it had when new. Ill have to look in the parts book and see what it came with
 
I would not switch the wires on the gauge.

Looking at some classic car forums, they say polarity does not effect the fuel gauge, but voltage does. If the gauge is designed for 6 volts, it won't work on 12v without adding a resistor. But that won't make it work backwards.

Did you ever get it to work with the sending unit out and manually moving the float? Do you recall if it was backward then? If it wasn't backward, I suspect it is just not reading accurately.
 
Take the glass off the gauge, and with a small paintbrush, change the F to an E and the E to an F. Problem solved!lol

Ben
 
(quoted from post at 06:45:00 05/13/21) Take the glass off the gauge, and with a small paintbrush, change the F to an E and the E to an F. Problem solved!lol

Ben
Click to expand...

Yeah!! Good one. All you really need to know is if you are close to empty. Just don't let the wife drive it or you will be hauling a fuel can over to the south forty.
 
Take the gauge out of the tank and hook it up, manually move the float from full to empty. If the gauge still does not read right, then the gauge and sending unit have different ohm range. If it is just off a little, then you might can adjust float to get it to read as close as you can.
 
On some car gauges there is an adjustment hole in the back of the gauge,usually it is plugged with wax or solder.
 
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