When I bought my boat just over a year ago the raw water cooling temperature sensor was broken/eaten in half. $165 got me a new one. Less than a year later it is malfunctioning, the alarm sounds all the time regardless of the engine being hot or cold. So now I have to replace it. I was told that they are 'a bit like a light bulb' and you don't know how long they will last. Is this true?, is it the fault of the product or is the engine vibration responsible?. Asking around, someones theory was to do with the 'harmonics' set up by the engine. My engine is a single pot DV10ME. Do the DV20's suffer the same thing??.