It Tells You When You Need to Refill Your Gas Tank
This page is the CodyCross answer for the clue below from Apothecary, Group 1972, Puzzle 5 (Surgical Instrument).
Question is: It Tells You When You Need to Refill Your Gas Tank
and the answer is: FUELGAUGE
Word Meaning:
FUEL GAUGE — An instrument, usually mounted on an instrument panel, which indicates the quantity of fuel in the fuel tank(s).
Definitions from Wiktionary.