I made one that uses water. That's what I get for having a fluid power professor for a father...
Since water is so much lighter than mercury, you need the tubes to be much taller. When my 750 is synched, it pulls the water up to ~10ft. Have some extra available, though. Just use regular clear tubing stapled to a piece of wood. Just in case the carbs are really out of sync and one cylinder pulls a much stronger vacuum, you put in overflow protection. If you don't, you might get water sucked into the motor. I used regular glass bottles. Made two holes in the cap, stuck two brass tubes in, then sealed the whole deal with epoxy. Then I stick the clear tubing over the brass tubes.
So you've got tubes going from each carb to an overflow bottle, then another tube goes from the bottle up 10 ft in the air, and back down into a jug of water.
As for adapters, my kawi has nipples on the carbs, so don't need any. My old suzy used a 5mm screw. So I took an allen, drilled a hole through the middle, then soldered a brass tube to which the tubing would attach. Wasn't pretty, but it worked.
If you've got money, just buy a set of guages. If you don't like mercuy, you can use needle guages. You need to calibrate them, but it's not that big a deal.
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