Duster Fuel gauge and Temp Gauge issues.

Hey guys, I just recently inherited my grandpas 71 Duster Twister. He is the original owner and it has sat in his garage for about 10-15 years and I’ve been working on it and got it drivable. New tank, fuel lines general sitting car stuff. I started to notice after replacing some fuel things was the Temp gauge and fuel gauge aren’t working. It wasn’t working before I replaced the tank/ sending unit. I replaced both and did the tests with key on and ground to the wires the basics. He did have an after market temp gauge on it and when I ground that out it pings out to the max but I try to get the original gauges to ping out and they don’t budge. Just trying to see if anyone has any ideas of issues before I just go ahead and order some new gauges and install them in the original gauge cluster, not sure if it is a fuse or anything I haven’t looked maybe might be one? Not the biggest pro on mopars definitely have learned a ton with owning this car. I’ll just throw in a photo of my car just for the fun of it if anyone is curious lol, also new to the group so if I posted this in the wrong forum I am sorry. Anyways thanks, Cayden.

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