Temp gauge not working

[72hoopti]

I put in a new sending unit on my 72. Ran new wire from passenger side to drivers side and got nothing. Gauge is pegged to cold.
Tried grounding wire to block and nothing happened. Read older posts about sending units being bad out of the box but hate to go through the antifreeze by pulling out the new one I just put in. Got power to the back of the temp gauge as well.

Any suggestions?
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