You DO have an audio vario in your sailplane, don't you?
If you don't, here's a cheap solution: Cambridge CAV II, dual range, dual damping rate, audio and 20sec. averager all in one 80mm (std "large" instrument opening) instrument with low 12V power draw. No issues, looks as new, switches, etc. all perfect. $200. Same capability as spiffy new Borgelt B400 at 1/3 price.
T8
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It's the one at lower right in this picture.
http://flypmsc.blogspot.com/2008/05/unbearable-lightness-of-being_19.html
-T8
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