Section R. 281.3116 - Main engine gaugesRule 116.
(1) On vessels designed for inboard or inboard/outboard (stern-drive) main engines, both of the following gauges shall be present: (a) A gauge to indicate main engine cooling water temperature for each main engine. The gauge shall be readable, by the marine inspector, from each helm position.(b) A gauge to indicate main engine lubrication oil pressure for each main engine. The gauge shall be readable, by the marine inspector, from each helm position.(2) All gauges installed on a vessel shall be in good and serviceable condition.Mich. Admin. Code R. 281.3116