The term 'DASH GAUGE' refers to a set of instruments used in cars to measure speed, RPM, fuel level, and electrical current. The crossword solutions for this term are SPEEDO (6 letters), TACH (4 letters), EMPTY (5 letters), and AMMETER (7 letters). SPEEDO is an instrument used to measure the speed of a car, TACH is an instrument used to measure the RPM of a car, EMPTY is an instrument used to measure the fuel level of a car, and AMMETER is an instrument used to measure the electrical current of a car.