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MSFS Slingsby T31 Manometer - cannot get vario code to work

I am new to modelling in MSFS and my Slingsby T31 is the first aircraft that I have built from the ground up. It's a vanity trip down memory lane to when I made my A&B certs as a cadet back in '65, inspired by Glidesimmer67's beautiful K7, and if I can complete it satisfactorily it will go onto flightsim.to for free dowload. It has been a steep learning curve and I am not familiar with the coding beyond much plagiarisation. Everything is working except for the Manometer which is displaying ft/min as a VSI not ft/sec as a vario. She flies quite well from faded memory but will need some expert opinion when the time comes!

My internal .xml file is attached (as txt) and there are a number of rem'd out code blocks under Interior Animations... Varios where I have tried initially to get the gauge_netto_needle working on a VSI I created for reference but without success. I hoped to use the code for the Manometer which can be found under the Behaviours and in Blender I suppress the Keyings of the green ball for any keys below 50% and for the red ball above 50%.

Can anyone see where I am going wrong and help me with coding for the manometer?


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SOLVED! I adapted the code found in the beautiful Schleicher K7 - with acknowledgement to GlideSimmer67 - and a few tweaks/ideas from other gliders. It's still imtermittently jittery but I have something now to work with.
Klem sorry I haven't visited this site in a while and didn't see your post. I wrote the animation/instrument code in the K7 and will help you with the T31 if that's useful. If you PM me on here we'll be able to exchange email addresses or something..