If you can't find one, (or it turns out to be expensive) you might
try the Mallettec audio vario advertised in Soaring ($169.00)...

I think that the Mallettecs don't have a hose barb for static - if
that's true, you can't plumb a TE probe into it. I prefer audios to be
compensated, they are much more useful that way.

I'll see what Piep stuff I have left in the garage. I think I have a
broken one, it might be fixable or yield parts for another one.

Thanks, Bob K.