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These things are awesome. Unplug the injector and turn the idle up. :sombrero:
If I were determined to do this I would just buy the adapter hose for a leak-down tester. Comes with the fitting to thread into either common automotive sparkplug hole on one end, and the most common (in the U.S.) quick detach compressed air male fitting on the other end. Make up a female X female adapter coupling and a normal air hose will connect. Mine has the male fitting directly crimped in place, so no changing the fitting itself.seems like you could canibalize a compression tester to make your own if you wanted. would probably need to be able to pull the injector plug for that cylinder in order to not be pumping fuel/air.
one other concern would be if the vehicle has aluminum heads, they don't like having the plugs changed while the motor is hot. you'd have a lot bigger problem that a flat tire if you boogered up a sparkplug hole.
I'd love to see some pics of an actual Chuffer.