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35 is fine, 50 only needed for 914 - the turbo !
Normal pressure is as high as it goes with the 912S - 
around 30.
steve v wrote:
> 
> Hi,
> While waiting for my constant speed to arrive, i have been 
> looking at the manifold preassure gauges and found that 
> they are available withe different scales - 35" or 50" FSD, 
> cannont find any reference anywhere on manufactures blurb 
> or the rotax installation manual as to which is needed, 
> i've got the run of the mill standard 912S, can anyone 
> shed any light?
> 
> Steve Vestuti #573  G-CEBV
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