I'm getting a FAULT SENSOR OIL PRESSURE on my Smartcraft unit, along with two beeps every couple of minutes. The oil pressure guage is reading fine and showing normal pressure. I think perhaps there's an oil pressure sending unit that feeds the gauge and also a separate oil pressure sensor that feeds into the Smartcraft unit. If that's so, where would I find the sensor so that I can check connections and replace it if needed? I have the mercruiser 5.0 MPI engine with sterndrive. Thanks for any info/photos.