Further study reveals that it is just ..\ssm\Custom\Item0 that has it's midzonevalue registry entry removed when the SSM logging window is closed. Item1 ~ ItemN appear to function correctly.
Sticking with custom dash analog gauges, I notice that if you create a gauge with negative values, a boost gauge for example, where it's minimum value might be -10 and maximum value might be 20, you cannot span the color layers over the negative range as the input box only accepts positive integers. These, of course, constitute one very minor bug and one small missing feature. However, once you have completed the user manual

perhaps these small issues, along with the ability to change the analog gauge face color, could be addressed.
Cheers
