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Webster 1913 Edition

Noun.

[Cf. G.

wegweiser

a waymark, a guide;

weg

way +

weisen

to show, direct.]

An instrument for measuring the distance which one has traveled on the road; an odometer, pedometer, or perambulator.

The

waywiser

to a coach, exactly measuring the miles, and showing them by an index.

Evelyn.

waywiser ‎(plural waywisers)

An instrument for measuring distance travelled; an odometer, pedometer, or perambulator.
- 1656, Evelyn
  I went to see Colonel Blount, who showed me the application of the "Waywiser" to a coach, exactly measuring the miles and showing them by an index as we went along.