On Dec 19, 7:28*am, Kimmo Hytoenen wrote:
I am updating the variometer system in our club ASW-19b. I would
like to add speed/vario switch into the stick handle. Any ideas,
advice and suggestion for components welcome!

Don't. Buy a vario with automatic cruise/climb switching. Otherwise
you will spend a lot of time with the switch in the wrong position.
John Cochrane