Question about voltage limiter

I've read about how a bad voltage limiter will cause the fuel and temp gauges to peg at the maximum
My question is....? Will a failing voltage limiter cause gauges to read about 25% higher?
I had 3/4 of a tank of gas this morning now it reads full, the temp gauge always ran about 1/4 of the way up now it runs 1/2
If this is the case where is a good place to buy a replacement? And is there a better option? I've read about home fixes but electrical work is not my thing and wondered if there was a solid state replacement or possibly 12 volt replacement gauges sold?
For a 1974 duster btw