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You can use copper tape but be careful as all cut edges are like razor blades. https://www.amazon.com/Zehhe-Copper...J6N6EH9B8D1&psc=1&refRID=V9M9N8K2QJ6N6EH9B8D1. You might have to glue it down afterwards to keep the repair good over time, just be sure you don't get any epoxy between the tape and the trace. The adhesive on copper tape is a special highly conductive one.
You can also use conductive ink pens like "CircuitWriter" or a "Silver conductive pen". Be warned that these products have way less conductivity than an actual copper trace, so it's fine for a signal (like the temp gauge input signal), but might not work for power (like one of the bulbs). Using multiple coats may help.
I know I have soldered wires to the instrument cluster printed copper before, but adjustable temperature iron is recommended. Soldering an actual piece of wire across the break will be the best repair.