My fuel guage is wonky too, it reads properly for the first 2/3's of a tank and then reads dead empty until I am just about out of gas and then it tells me that I have about 1/8 of a tank when I am about to run out.
I tried changing the sending unit and it didn't help so there is the possibility that iyour gauge may be screwed.
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393W: AFR 205's, hydraulic roller, TKO600.
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