there is, as always, somewhat more to it than that
the 'accuracy' of mechanical gauges is not linear, which is to say they will be 'off' by more at their extremes than in the central reading portion
if you want even a semblance of accuracy you need to select gauges that will yield a mid-range reading at your measurement point
and no, interpolation is not a 'valid' measuremvent, just an approximation
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