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A lot of times, bad performance come from a change that was made. The fact the car ran well before suggests adding the gauge caused the problem. I'm guessing it was installed in the rubber line.
Lets see:
Did you spray clean the inside of the new gauge before installing? If you didn't, dirt may have blocked something.
Does replacing the gauge with a piece of pipe solve the problem? If it did, it's the gauge.
How old is the fuel hose near the gauge? Did the pushing and pulling on the rubber hose separate the inner gas liner from the outer woven part of the hose and create a fluid pinch point in the line? This sometimes happens with the old rubber brake hoses.
What did you touch near where you were working? Disconnect a ground? break a wire? etc.
Hope that helps.
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