Did you actually replace the Gauge fuse or just visually "inspect" it? If the fuse IS new and definitely good then test at the fuse box to see if voltage is getting that far with the key in the "on" position. If it is then follow the line and test at the next junction. The circuit branches off pretty quickly, IIRC so you should have to look far. Many of the non-operations components you list as on different grounds, so that's out.
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