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That sounds like a squeaking ancillary belt (fan belt) to me. This belt drives things like the alternator. May just need adjusting, but may need replacing.
Sometimes the noise changes when you add electrical load to the alternator by turning the lights on and the window demister etc.
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The fact that the gauges read empty when the tanks were empty and changed after the tanks were filled is encouraging, it means the gauges at least partly work.
The simplest explanation is that they do work, and that they are accurate, just that they are connected to the wrong gauges. You filled one tank to 40%-ish and one tank shows just over a 1/4 full, the ...
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I am a former accessory drive engineer at Gates. The squeal you hear can be due to a couple of reasons.
Your belt has worn out. Depending on their construction, (usually either cotton, polyester cord or aramid cord), belts stretch 2-5% of their length and wear down deeper into the grooves. This causes their friction to change and results in noise. Check ...
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