petrol gauge(n = noun.artifact) gas gage, gas gauge, gasoline gage, gasoline gauge, petrol gage - gauge that indicates the amount of gasoline left in the gasoline tank of a vehicle;
is a kind of gage, gauge
is a part of fuel system

broad gauge, depth gauge, fuel gauge, gas gauge, gasoline gauge, gauge, gauge boson, micrometer gauge, narrow gauge, petrol, petrol bomb, petrol station, pressure gauge, rain gauge, sea gauge, standard gauge, strain gauge, surface gauge, vacuum gauge, water gauge, wedge gauge, wind gauge, wire gauge