There should be a place for a pressure gauge--you shouldn't have to do any modifications to make it work. Do you still have the directions for the pump/filter?

You'll be able to follow the links in the sigs right now by logging out and then accessing them from a post either Watermom, Ben, or I have made in any thread. Once Ben upgrades your registration, though, you'll be able to follow them without logging out. It's a temporary inconvenience, but part of a system Ben has put in place to discourage spammers/hackers from the forum. We're trying to keep this as safe a place as possible.

Did you try the bucket testing on your water to see about removing the calcium?

Janet