I'd highly suggest you look into an Ancient Artifact, Model 7 (don't get the 6, those suck.) The George B. Ancient corporation still manufactures them although they can be pricey, I can assure you that they are of incredible value when troubleshooting encabulators. It allows you to see how the Johnson-Reymin transport is functioning, which as you know is the most important part of the system. You'll find they go well with fixtures from any era, so there's no need to worry about it clashing with the faucets or towels.