Ric,
After all the discussion and reading the various viewpoints and opinions, I think I have changed my mind about how these gauges are basically useless... Just like you point out, they might provide interesting data when off-roading. Also, they would actually serve a useful purpose if, during a walk-about--- checking the trail ahead--- you could take the gauge out of the H2 and approximate the hill's slope BEFORE driving on it.
Personally, the gauges that show 0 to 45 degrees seem less useful than the gauges calibrated from 0 to 30 degrees. If you had the second gauge and the ball bearing goes off the scale, you could just say that it is "TOO" steep?
I think that the lower range of 0 to 30 would also make it easier to more accurately read what the slope actually is too...
Maybe I will use velcro to attach the gauge so I can remove it for gauging slopes while walking around?
Now I have to find out where the 0 to 30 degree gauge was available...
Ed