Wis. Admin. Code § Trans 301.23
(1) Every HSV originally equipped with any of the following instruments, warning devices, or gauges shall be maintained with that equipment or a comparable replacement in good working condition:
History: Cr. Register, March, 1982, No. 315, eff. 4-1-82; r. and recr. (1) (intro.), am. (1) (a), Register, April, 1997, No. 496, eff. 5-1-97.