67 Dart Fuse holder has a bed cell - What are my options?

The gas and temp gauges started going out intermittently on the Dart and finally died altogether. I've narrowed it down to the fuse box, All the fuses's test out at approx 12 volts on the multi-meter except for the fuse in the last slot, the Instrument fuse, which has no reading at all. I also have no power reading at the Delimiter which is new and has been tested.

Maybe the fuse holder plastic case is cracked or the wire going in to that fuse is loose or otherwise bad. It looks like it c/b the original fuse box based on the wiring clusters going into and out of each side which look original and are taped from the factory.

If I could get some help understanding what the options are that would be helpful.

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