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Author Topic: Fuel Guage Resistor  (Read 1151 times)
Dusk_Blue_Z
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« on: May 08, 2012, 06:05:36 PM »

Is an in-dash fuel guage resistor different from the one on a console fuel guage?

Thanks,

Nick
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1969 X77 01B 51 51 flat hood
69pace
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« Reply #1 on: May 09, 2012, 07:41:41 AM »

Nick If I remember - not near my database - the factory units both used a wrapped style resistance wire of approximately 40 ohms.
New replacement and some of the reproductions fuel gauges use a ceramic "shunt" style resistor that is rated at 45 ohms. Other reproduction gauges have the resistor internally mounted.

The factory temperature gauge also used the same style wrapped wire resistor but the temp gauge units were rated at approximately 84 ohms, so are not interchangeable with the fuel units.
Ceramic replacements of 92 ohms are available now for factory and reproduction temp gauges, and again some of the reproductions have the resistor built in.
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1969 Z-11 350/300 with 4 Speed
Dusk_Blue_Z
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« Reply #2 on: May 10, 2012, 07:09:57 PM »

Ok, thanks. That helps make sense on why my old fuel gauge isn't working properly (I put a new style resistor in).

Do you know if anyone makes a 40 ohm resistor? Or am I better off finding a used fuel guage unit?

Thanks,

Nick
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1969 X77 01B 51 51 flat hood
69pace
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« Reply #3 on: May 11, 2012, 06:15:46 AM »

Nick If you are using a new ceramic shunt on the old style fuel gauges you do have a few options.

The easiest is keep the new resistor and to learn where the new landmarks on the gauge are and live with it. But that can be annoying if you forget or someone else is driving and they don't know the new landmarks on the gauge.

But removing the new resistor and getting the correct value is cheaper then buying a new fuel gauge, or looking for an used with the resistor intact. You already have a gauge why buy another. Here are a few option for replacing your ceramic unit.

Option one is to search some on-line sites for an original style NOS or reproduction resistor. I think I last ones I saw offered were at a major Corvette parts house.  As with everything beware of NOS offers since an original wire wrapped 40 ohm unit are rare and expensive. The wire reproductions come in many values so double check that it is 40 ohms.

Another option is that you can make your own with resistance wire of the correct length - you would use a meter to find the 40 ohm length, then wrap it around a cardboard, poster board or nylon or plastic "carrier" of the same size and shape as the originals did. The wire can be purchased at any electronics house including Radio Shack.

But baring you wanting it to look factory original for judging then you can buy a standard 40 ohm resistor at Radio Shack and hook it up between the the two leads as the original was and be accurate no arts and crafts skills required.
 
Another lazy option of using the ceramic resistor is If you have the dash mounted fuel gauge is that you can gently reset the pointer.  Open the dash pod face when you have filled the tank. You will reset the pointer to the new full point on the gauge by pulling it out until you feel it disengage,  then when in the new location of "FULL" gently push the pointed back in until you feel it click.  If you have a console gauge that is not an option as they are not resettable.  But I would just replace the new ceramic unit with a RS resistor option and be done.

Brian
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1969 Z-11 350/300 with 4 Speed
Dusk_Blue_Z
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« Reply #4 on: May 11, 2012, 02:09:33 PM »

Wow, looks like there are a few options. Thanks for laying them out Brian.
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1969 X77 01B 51 51 flat hood
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