Ok, Thanks all, I do actually like having sized correct wrench when I do work, especially on motors. I figure for now I'll at least grab an adjustable spanner wrench and 10" or 12" adjustable wrench. I'll measure next time out, hopefully this weekend for sure.
Good feedback on the tank filling process, I was going down the gauge process also as a nice project. The previous owner used the fresh water for flushing the head and we plan to keep doing that since we are just day sailing and it seems to be an improvement in head smells. Got to pick up the special Toilet paper also before next trip before I have a revolt by the crew too.