Gauge of tubing???

I"m familiar with the use of 'gauge' when describing sheetmetal.

I'm looking at 43.13 where it discusses welded patch repair. It says
make the patch out of material one gauge greater than that of the base
metal.

So I measure the base metal tubing (.035), go to the Inet and look up
a gauge chart and find that .035 lies between two gauge measurements.
And of course tubing suppliers talk in decimals, not gauge.

Faced with this difference in units of measurement, what approach do
you take? - Mike