Just so you know LadyAg, the Juki does make a guage for it. It is two sided. I ordered it before knowing about the Jenome foot, and would have ordered the Jenome foots instead had I known. The gage by itself is $59.99. Same price as the Jenome foot.
I haven't used it yet, so can't comment on it. Too bad that stitch in the ditch foot that comes with the walking foot doesn't work with the Juki.