nice one. Oh, and by the way, for those who would love a sight glass to check their boat tanks - fuel or water - it doesn't have to be glass. A decent grade of clear tubing will do, and a t-junction near tank bottom is all it takes.
I set that up to monitor my water tanks back when i had a boat, but transferred the idea to my home water tank the other day, but just upsizing everything. Works well. The clamp is to close the tube off leaving just enough air leak for it to work, but otherwise seals the end.