bifflefan, does it seem to be pretty accurate? damn it looked like a pain to remove the tank. Just thought if the tank was full and used a none power hand drill that it work. But you are probably right about the screwing up part!
I just installed it on sunday but it worked when I filled it up. You could probably do it without removing the tank but whats the fun in that. I got somany good ideas when I could see what was happening under all that plastic.