Houston.... we have a problem!

Riff Raff said

Braided line is best no doubt. An old hot rodder trick is to coil up a couple turns with the copper line instead of a straight shot from the block to the guage. Do like 2/3 loops about an 1 1/2" diameter before you run it through the firewall.

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This is EXACTLY how you are supposed to do it. The loops are a stress relief on the copper line. Bend the line from the block connection to a point near to an engine bolt so you can put it through a clamp of some sort that is bolted down; that takes the stress off of the block connection where this broke. Then put loops in the run to the firewall.