Gas Gauge Wonders

[YotaFun]

I have a 97' SR5 Auto 4WD
This past winter, right about February,
I started to have issues with my gas gauge.

However recently I have come to find out that it is not the sending unit in the tank...

Somehow my fog lights are messing up the gas gauge.

When my fog lights are on, the gas gauge reads 1/4 below what it is really at.

When the fogs are off, it is normal.

At first I thought this might have been a ground issue with the fog lights.

But after grounding the fogs right to the frame.

I still have the same issue as when the fogs were grounded to the bumper.

Can anyone give me any input on this?

Because I would like to be able to drive with the fogs on, without having to remind myself every time that the gas gauge is reading a 1/4 below what it is.

I will get some video footage in a bit.

Thanks for the help.
~Avy

 

[YotaFun]

Here is the video to show what I mean.

 

[TNTEMPEST]

Still could be a ground problem, the main ground to the battery. Just because you are grounding the lights good to the frame does not mean the frame or engine is grounded good to the battery.

 

[YotaFun]

Would this cause an intermittent starting issue as well?

Any clue where these grounds are located?