OK folks this might be the dummest question but... Is a vacuum gauge going from 30" of vacuum down to 0" the same as a manifold pressure gauge going from 0" of pressure up to 30". If so, and it's just a dial face change, why are the latter so much more expensive. See, for example, in the Aircraft Spruce catalog (mine is old at 1998-1999):
Mitchell vacuum gauge PN 10-25125 for $35-50 and manifold gauge PN 10-25145 for $71-50. Why couldn't I just remove the dial face and mirror image it? Does anyone know of a supplier of 2 1/4" manifold gauges that are cheaper. Egauges have an ISSPRO but it's calibrated in psi and I don't like its look. VDO don't seem to make a MP but do have a vacuum and this might be what I get since it matches my other gauges. Awaiting the dunce's hat in the corner!! John The Martindale Family 29 Jane Circuit TOORMINA NSW 2452 AUSTRALIA phone: 61 2 66584767 email: johnj...@chc.net.au
