With respect to Sorby, and everyone here, you don't actually need a gauge at all. Establish the angle using the chisel plate (for flat tools) then swap to the profiler. Once your fingernail is ground, slide the profiler to the left as far as it will go with the gouge still clamped in place, and offer the gouge up to the metal housing plate to the left of the abrasive. Scratch a line into the plate at the top of the gouge tip or put a sticker there and next time, just line up your gouge with that mark. A few seconds work, and infallible. (I hope it makes sense)
