65 Barracuda gauge problems

I just aquired a 65 plymouth barracuda recently, 273 auto,904 presumably. Engine has been mildly built and runs really strong. I LOVE THIS CAR! She is my baby! Anyways, I am having an issue with the fuel and temp gauges. They do not work. Gauge reads empty and I just filled it up, and temp never comes off cold. I have done some fairly extensive research and found out that a common problem is the voltage limiter for the gauges. I replaced with a new one(aftermarket), and still no gauges. I was thinking it would be a sending unit problem but the temp gauge also does not work. I have a wiring schematic on the car and located the wire from the sending unit but havnt tested it yet. I'm thinking it uses resistance to operate the gauge but im not all that familiar with this kind of troubleshooting. I did use my testlight and check the limiter for power and Its not showing any. Neither is the actual plug in wells on the printed curcuit. I checked the harness to the cluster unplugged and have one wire with power. But when plugged in I have power through several wires. Any help on testing the fuel gauge sending unit wire or troubleshooting the gauge cluster would be much appreciated! Thanks everyone! I will also post pictures of the car as soon as I figure out how to uploadd them to the site(I'm new here)!:banghead: