Fuel gauge not working on 2005 ford mustang

To troubleshoot the issue, i suggest you few help links with accurate solution step by step:---
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Fuel pump not running?
http://schematicsdiagram.blogspot.in/2012/02/fuel-pump-not-running.html
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Fuel pump not working on 1991 Ford Ranger?

http://technoanswers.blogspot.in/2012/01/fuel-pump-not-working-on-1991-ford.html

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Fuel pump has no power on 2002 ford 350 7.3 diesel?

http://technoanswers.blogspot.in/2012/01/fuel-pump-has-no-power-on-2002-ford-350.html

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Emergency fuel shut switch on Ford car?

http://schematicsdiagram.blogspot.com/2011/12/emergency-fuel-shut-switch-on-ford-car.html

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How to jump fuel pump On Chevrolet Silverado 1500?

http://schematicsdiagram.blogspot.com/2011/12/how-to-jump-fuel-pump-on-chevrolet.html

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How to Increase gas mileage on 2011 2500HD Duramax 6.6?

http://schematicsdiagram.blogspot.com/2011/12/how-to-increase-gas-mileage-on-2011.html
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How to test Fuel Pressure and replace Fuel Pump?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-fuel-pressure-and-replace.html
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Fuel Running Lean

http://technoanswers.blogspot.com/2012/10/fuel-running-lean.html
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How to relieve fuel pressure?

http://technoanswers.blogspot.com/2012/01/how-to-relieve-fuel-pressure.html

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Refueling problem?

http://repairhelpcenter.blogspot.com/2012/01/refueling-problem.html

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Toyota Tercel consuming more fuel?

http://repairhelpcenter.blogspot.com/2012/01/toyota-tercel-consuming-more-fuel.html

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How to maximize fuel economy on your vehicle?

http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html

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Fuel gauge jumps from empty to full?

http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html

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Gas gauge stuck on empty on 2002 Mercedes Benz 240c?

http://repairhelpcenter.blogspot.in/2012/02/gas-gauge-stuck-on-empty-on-2002.html

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No power to the control side of the fuel pump relay?

http://schematicsdiagram.blogspot.com/2011/12/no-power-to-control-side-of-fuel-pump.html

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These will help.

Thanks.

For me it was the inertia switch had some dirt in it pulled the connector and cleaned it out and suddenly it started working after i checked and replaced everything else

This is due to a problem with the gears in the speedometer and fuel gauge; there was a manufacturing defect that ford fixed in later years. The cheapest solution is to replace these gauges. I found a local mechanic that knew how to fix it, and did the job for $60. I recommend checking craigslist for a local person, because this is a very common problem.

For the fuel gauge: This is due to a problem with the gears in the fuel gauge; there was a manufacturing defect that ford fixed in later years. The cheapest solution is to replace the gauge. I found a local mechanic that knew how to fix it, and did the job for $60. I recommend checking craigslist for a local person, because this is a very common problem.
As for the check engine light, you will probably have to take it to a dealer to have them look into the car's computer.

If the gauge remains in one position, on or off, full or empty, then it may be a bad gauge, or a faulty voltage regulator for the gauge. If the instrument panel is removed, there is a printed circuit on the back which ties to all gauges and lights. Check it for breaks or corrosion. The voltage regulator should be mounted to the same area and supplies regulated voltage to the fuel gauge. Hope this helps!

dealer only computer glitch ,2005?? chances are its using encrypted software

This is pretty common on the 2005 Mustangs, it's caused by failing stepper motors in the instrument cluster, they control the movement of the gauges. Repair is around $180 and there's a guide on how to fix them yourself here - 2005 Mustang speedometer problem

Common problem on the 05 Mustang instrument clusters, it's caused by failing stepper motors on the cluster's circuit board and it can be repaired. Check out this page for more on how to get it fixed - 05 Mustang speedometer problems

there is only one thing that causes this, the fuel gauge sending unit inside the fuel tank is defective.

Repair or replace the sending unit in the tank.