Temperature gauge help

[vettedad61]

On my 1972 c10 with factory gauges I recently restored the whole truck, new factory correct wiring harness, new cluster schematic and sending unit.

I hooked everything up and recently got the truck running after restoration, The temperature gauge is original and the needle doesn't move? I have used a test light and tested power at the sending unit and also at the connections on the back of the temperature gauge. I don't show it getting power at either spot

Can someone help or give me starting point to find the problem? Thank you!

the fuse panel is glass style fuses.