46 CFR §143.230

1. (a)Each towing vessel must have a reliable means to provide notification when an emergency condition exists or an essential system develops problems that require attention. The following alarms must be provided:
   1. (1)Main engine low lubricating oil pressure;
   2. (2)Main engine high cooling water temperature;
   3. (3)Auxiliary generator engine low lubricating oil pressure;
   4. (4)Auxiliary generator engine high cooling water temperature;
   5. (5)High bilge levels;
   6. (6)Low hydraulic steering fluid levels, if applicable; and
   7. (7)Low fuel level, if fitted with a day tank.
2. (b)Alarms must:
   1. (1)Be visible and audible at each operating station. The alarm located at the operating station may be a summary alarm; if the alarm at the operating station is a summary alarm, the specific alarm condition must be indicated at the machinery or bilge location;
   2. (2)Have a means to test actuation at each operating station or have a continuous self-monitoring alarm system which actuates if an alarm point fails or becomes disabled;
   3. (3)Continue until they are acknowledged; and
   4. (4)Not interfere with night vision at the operating station.
3. (c)The following systems must be equipped with gauges at the machinery location:
   1. (1)Main engine lubricating oil pressure and main engine RPM;
   2. (2)Main engine cooling water temperature;
   3. (3)Auxiliary generator engine lubricating oil pressure and auxiliary generator engine RPM;
   4. (4)Auxiliary generator engine cooling water temperature; and
   5. (5)Hydraulic steering fluid pressure, if the vessel is equipped with hydraulic steering systems.