The stock volt meter without numbers would have to improve dramatically to "suck"....the only gauge worse is the stock oil temp....also without numbers....what are we mind readers???
Rip it out and get a new one with numbers....also consider re-wiring it so that it reads correctly. While you are at it, $hitcan the the clock that probably doesn't work, either.
30 year old gauges are like 30 year old dogs.....probably dead....or should be.
Brutal but true....can't tell ya how many times I have heard the story...."but my gauges said....." right after someone toasted the engine....
