Looking at variometers and probes; configuration for mounting in stabilators. Choices are
Single probes for Total Energy, Pitot, and Static Port, All-in-one probe as shown in the factory drawings.
Vendors are Cumulus Soaring, Inc. and Wing and Wheels.
Variometers
LX EOS Speed-to-fly Variometer with GPS flight recorder, navigation, Thermal Assistant, and FLARM display for $1,295.
VariometerILEC SC-7 Variometer with Audio and Averager, $795
Probe mountST-1 8mm mount for Total Energy Probe, $30.
Wings and Wheels suggested that the triple probe has three o-rings that would be more problematic that using single probes. Looking at other TE options, like the MGL Avionics G3 series that can use TE inputs.