FWIW, any K-type thermocouple will work with any gauge.
If you don't have a bundle to spend on this, don't compromise on the probe and get the best quality probe obtainable (Hewitt is up there), so you don't have to worry about anything melting and ruining your turbo.
The gauges can be found in truck salvage yards for about $20.00.
The boost gauge can be any pressure indicating gauge with the proper range, also about 20 buckaroos.
Jim, I like the simplicity of your mount.
It's fun to see how these mods catch on, makes me feel old.....after the air intake elbow, fording mods, flipped hubs etc, what's next, the turn signal buzzer?......