Talking to a guy today that has ran numerous boats suggested I install Murphy gauges such as these on my Detroits to warn me if the coolant level drops. Anyone have them on their boat and if so where are they installed, experience with them, etc? Was suggested to me to install to monitor coolant level in tank with an external alarm. Thus if coolant level drops due to leaking or busted hose you would know before engine overheats. Sounds like a good idea and they are only about $100 bucks each. I was thinking of mounting on engine room bulkhead and piping over to the coolant tank. They also provide a visual gauge so you dont have to stick your finger in the radiator cap to check levels as you do on mine which are inches from the ER ceiling