You might consider testing the gauges by covering them with a large balloon and rubber bands, but it may be easier to acquire (XL) condoms and use electrical tape (stretches, so it may seal around connector nipples better).
I do 10-11.5 gallon batches into 60L Speidel Pastic Fermenters (MoreBeer carries them). I have my fermentation freezer on wheels and a pulley for lifting them out. Cheap, easy to clean, surface area for trub is huge. It's well sealed, so I use a spare spout to feed 2-psi co2 through the top...