Conrad, if you're talking about a vacuum gauge for synching all 4 carbs at once, i can say the mercury filled "sticks" are no longer available. Motion Pro still makes their vacuum gauge, but a different medium is now used instead of mercury. I have heard this medium has a fair amount of "bounce," unlike the old mercury filled sticks, but still gets the job done. A local friend of mine bought an inexpensive hand held CO analyzer he used to set the carbs on his K1, as i recall he paid around $200 for it. Measuring CO out each exhaust is more accurate than measuring vacuum. I would imagine one could find an inexpensive hand held CO analyzer on the internet or ebay. I used to have a set of the later Honda gauges as shown in the Service Bulletins, some people swear by them, i never cared for them, the needles danced too much for me to feel like i could get a decent vacuum measurement.
