I have a very old (30-50 years old?) oil tank in my basement and the
gauge has stopped working. I tried to loosen it up with a big wrench
to see if it just got stuck inside but it wouldn't budge. My father-in-
law said I'd need to affix a long pipe to the wrench to loosen it. Is
there any way I can damage the tank by using this extra force. What
I'm worried about is the plug being rusted to the tank and the force
actually breaking the threads.