Section 63(3)(e) in The Central Motor Vehicles Rules, 1989
(e)[ the applicant maintains in good condition, the equipment and apparatus for undertaking test pertaining to [exhaust gas, engine tuning, engine analysis] [Clause (e) substituted by GSR 933(E), dated 28.10.1989 (w.e.f. 28.10.1989).],smoke emission, brake system, head-lights, wheel alignments, compressors,speedometers and other like components;]