Glennmac,
I use TnT all the time since I got mine finished. It is hilly around here, so I am always trying to make a cut where it is easier when the scraper is tipped in comparison to the tractor.
I need a tilt gauge. Before I go out, I do a quick check on my flat driveway. It is easy to check if the implment is level in the field too. When my side link is centered, it is level. I have 4" of side link travel; when 2" of cylinder is exposed, it's pretty darn close to level. It is easy to see from the drivers seat.
The New Holland, I think a TC19, that I saw with two side links. It used one lever, and had the hoses set so it pushed one side down, the other side up, and vica versa.
RobertN in Shingle Springs Calif