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Keep in mind the test BD mentioned is used to provide baseline functionality tests. It does not factor in the dynamic results of your system, i.e. resistance in the circuit, voltage drops, intermittent connections etc. If you have the functionality now there is no point in furthering those tests.
i know its not going to look the best but your fuel cap will cover the fuel hole most the time. but disconnect the fuel filler from the fuel tank hose, take a hole saw bit and cut the hole bigger. if you go big enough you can fit the semi pump nozzle in there and fill up fairly fast
The fuel gauge sweeping to 3:00 o'clock is due to an open in the signal lead connecting the sender to the gauge. The senders connect to the dash gauge through the tank selector valve, bypassing the dash switch entirely.