I have an old '76 35HP Johnson (electric start) that I want to install a water temperature gauge or alarm on. It does not have any type of sensor, gauge or alarm on it now so I'm starting from scratch. I can install a gauge or horn but haven't a clue how or where to install the sensor. I see that the sensors available in catalogs are screw-in but will they work on my OB and if so, where does it screw in?<br /><br />Thanks for any help.<br /><br />Frustrated in Mississippi 