All 3 Uses

indicate
in
Frankenstein - 1831 version
(Edited)

I am, however, in good spirits: my men are bold and apparently firm of purpose, nor do the floating sheets of ice that continually pass us, indicating the dangers of the region towards which we are advancing, appear to dismay them.
p. 23.3 *

indicating = showing
Morning, dismal and wet, at length dawned and discovered to my sleepless and aching eyes the church of Ingolstadt, its white steeple and clock, which indicated the sixth hour.
p. 60.1

indicated = showed
From this time Felix was more employed, and the heart-moving indications of impending famine disappeared.
p. 117.1

indications = things that serve as signs to show other things

Definitions:

(1) (indicate)
to show (point out, demonstrate, express, or suggest)

The form, indicator can refer to many different kinds of things including intentional signals (such as a turn indicator), gauges (such as one that indicates pressure), or a measurement (such as an economic or chemical indicator).
(2) (meaning too rare to warrant focus)