Can '64 Dart Temp Gauge Be Adjusted?

At thermostat opening, my temp gauge reads just off the bottom mark. I'd like to adjust the needle to be at least on the bottom 1/3 mark. The Factory Service Manual talks of using a factory tool to confirm a low, medium, and high reading on the gauge but then says to replace the gauge if it doesn't read correctly.

Can these gauge needles be adjusted?
Is the sender correct? And is the gauge voltage limiter working, that's the lil metal box that plugs into the cluster with the noise/static filter , looks like a one wire capcitor. How's the fuel gauge accuracy?