Abstract: A device for sensing the presence of water within the exhaust manifold of a marine engine. A probe is provided having a first conductive element and a second conductive element operably extending into the main exhaust gas chamber within the exhaust manifold. Circuit means are provided having an input operably coupled to the probe for sensing and displaying a reduction in the effective impedance between the first and second conductive elements responsive to water being operably coupled therebetween.

Abstract: This application discloses an apparatus and electrical system for sensing the wear within an engine by detecting the presence of metal pieces which have become dislodged from the engine. The metal pieces are detected by collecting them upon a filter which is located generally within an inductor. The permeability of the inductor is measured as a function of the inductance, and the inductance becomes a measure of the number of particles collected by the filter.