Hi Reinhard,
I have spotted a bug in wind direction gauge in the SteelSeries library today. I have just pushed out version 2.5.3 of the gauges to pick up the patched library files. The only file you *need* to change is steelseries_tween.min.js (the source files steelseries.js, and steelseries.min.js have also been updated if you need them).
I see you have spotted my 'altimeter' cloud base gauge - that is non-standard, a 'tweak' for my personal site.
The standard gauge is a radial pointer gauge like most of the others. If enough people shout for it, I may make put the altimeter into the standard distribution at some point - the problem is that at present the pointers are fixed colours, and I have had to hack it to add the title and unit strings.
Most of the improvements in 2.5 are 'under the hood' but should make to code more manageable. I've also moved the code to GitHub to encourage others to help take it forward, and I can put my feet up. Ha!