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There is no spring... ? The cylinder dimensions will depend on the accelerator pedal dimensions as well as the distance from the cylinder attachment to the fulcrum point on the pedal. I would buy a stainless cylinder, and the vacuum reservoir isn't necessary as long as the seals don't leak in the cylinder.
It shouldn't be difficult to assemble a lean/stoich/rich indicator for your typical narrowband O2, and there are a number of them on the market as well, IMO far more useful than a vacuum gauge.
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