My experience is that they are one and the same. If a tachometer shows 0-10 on the gauge it doesnt mean an actual measurement cannot be above 10. It's the same as what is described in the Help section that was posted. You're setting the minimum and maxium (0-10) that can be displayed. Doesnt mean an actual measurement cannot be above that. The minimum and maximum of actual measurement would set up in the ladder logic.