I don't know what the range of your gauge is, but I run my Ruby at 40 PSI. The safety shouldn't be above 60, preferably around 40. If you ran the pressure high enough to damage the gauge you safety is set way too high.
The Ruby likes to have some load, makes it easier to control. Running a steamer up and down grades does take the throttle and J-Bar and takes some practice to get the coordination right.
Winn Erdman Steamaholic 291