Fuel/Water Temp Gauge Issue Found! Now what...

So, I'm bringing back my old thread here since I'm still working on the problem. I thought I had solved the problem by soldering the damaged circuit and replacing the voltage limiter with a new RTE limiter, but the fuel gauge still didn't work. I thought maybe my solder repair wasn't sufficient, so I found a deal on a new circuit board. Still had the problem.

I bench tested the gauge, gauge is good. I tested the voltage limiter alongside the old limiter for resistance, found the new one had about 13 ohms, while the old one had close to zero. Now, I don't know much about electrical troubleshooting, so I put the old one back in to see what would happen. The fuel gauge needle moved, albeit just a tiny bit. Fuel tank is full.

So, could it be I have a bad sender and that's why the gauge isn't moving all the way to full?