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Where is the ground lug?

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Installing a Hansshow display on a MYP and it needs to be connected to the battery. I’ve found the positive but the negative lead on the harness they give you is very short. I read in another post it is because there is a ground lug in the passenger foot well to connect it to but I cannot locate it. Does anyone one know what to look for? First pic: battery and red/positive Second pic: passenger footwell where there should be a ground lug?
 

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Almost any silvery screw that's going into metal will be a good grounding point. In that second picture I see such a screw in the upper left, seemingly with a braided line connected to it(might just be going behind it). You could unscrew that screw a bit and slide your new wire under the bit of metal its holding down. I don't know what the end of your wire looks like though.
 
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