It's print film, you shouldn't need to use a meter at all. With ASA 800 film a fully open aperture and a shutter speed of 1/30 to 1/60 would have been fine in your circumstance. You could have pushed the film to 1600 and closed the aperture down to get a better Depth of Field. Even if it was two (or more) stops off either way, it would have come out fine.
My experience in shooting dark, dimly lit interiors (with slide film) is that ASA 400 pushes the limit of fast, wide lenses. f2 or f2.8, shutter speeds of 1/15 to 1/30, going down to 1/8 in really dark areas. I recently had my Pen FT with me, loaded with some Kodak VS (ASA 100) when I found myself wanting to take some shots in a pretty dim interior. Since the meter wouldn't work in such dim light anyway, I just worked off the numbers shown above. Since the lens only opened to f3.5 I took two stops for the aperture and two stops for the film speed. This gave a shutter speed of 1/2 to 1 second. I braced the camera as best as I could and ended up with some nice, well exposed slides.