Temp Gauge Issues

[Awann99]

I’m trying to get the temp gauge working on my tach/vacuum cluster. It sits dead in the middle when the key is off or on. It will jump to the hot side and back to the middle when I start the truck. I pulled out the fuel wire from the fuse box and the temp gauge pinned at hot. I’ve tried grounding the green wire to the engine and the gauge doesn’t budge. The green wire doesn’t seem to have any breaks and it is connected firmly to the fuse Panel box from the engine bay to the cab. Is there a way to just bypass the gauge cluster and run the temp gauge separate?
Thanks.
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