I would say it would be best to take it to an instrument rebuilder. Maybe
someone on the list knows more about this.
Dave Yealy wrote:
> Is there a way to calibrate a dual "Smith's" gauge?
> Mine reads 10 lbs (hot) at 800 rpm idle and 45 lbs while running.
> 60 Bugeye
> At 05:33 PM 6/21/2002 -0700,
> >My Bugeye reads "5 PSI" at hot idle and "43 PSI" at hot speed. This
> >worried me,
> >so I connected a CALIBRATED oil pressure test gauge in line with the gauge
> >The 5 PSI reading was actually 20 PSI and the 43 PSI hot reading was
> >actually a
> >little over 60 PSI! This "off" gauge reads over 20 psi cold at idle and
> >80 psi
> >at speed. If I interpolate this, my cold pressures are somewhere around
> >PSI at idle and 95 PSI at speed until warmed up. Calibrate the gauge next
> >and you might be surprised, even if it is reading "normal"!
> >Mike MacLean-60 Sprite
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