How can a tide gauge be used to measure the wave height of a tsunami?

I am looking at a tidal chart of the 1960 tsunami that hit Hilo. http://pubs.usgs.gov/circ/c1187/images/fig17.jpg
That’s the chart,

I count 13 crests…it IS confusing, though.

The height of the wave that destroyed Hilo looks to be 20 ft to me, also.

Z-axis electronic Height Gauge tutorial

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