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My gas gauge never reaches full; more like 3/4. I figure it's either the gauge or the tank sender. Anybody have this problem? Is either adjustable?

Thanks

yes it is. you will need to remove the unit and adjust the float.

Before you go tearing into your gas tank: Does your temperature gauge read correctly? If your temp is also reading low, I would bet the problem is the instrument panel voltage regulator. If you look at the circuit diagram, you'll see that if you don't have a full 8 volts I believe it is then both your gauges will read low. Both the gauges on my truck read low, and I'm just living with it for now but in the future I will either adjust the stock voltage regulator or put in a solid state regulator. (There's a waveform that those bimetal regulators produce, it's not actually DC, so that might take some doing to get around to replace it with solid state).

Yea mine always reads 1/4 tank I just fill up every day

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currently working on my 1977 luv truk

The gauge regulator is just a relay looking thing that plugs into the back of the instrument panel circuit board. Usually easy to replace. Of course finding the correct replacement may be more difficult.

my gas gague doesnt even work

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77-luv-stock (Selling or Parting out motor blew up)

75-luv mikado-V8 350 soon