Hey yall! I was just wondering. I have a 18' 1975 open bow Mark Twain with a 165 hp Mercruiser. Currently I have one 18 gallon gas tank and I am parting-out my 16' Twain which also has an 18 gallon gas tank in it. Would it be safe to put two 18 gallon tanks in it. I have heard mention here about proper grounding. Sounds like rocket science to me. Any advice 