I just bought a 95 astro with 115 mercury tested with rabbit ears no prombelms first time in the water low oil light and buzzer went off check oil added oil motor seems to run fine but light and buzzer will not go out is a censor probelm or oil injection probelm the manual says its the later people I know says there is no such probelm as not enough oil how can i fix this or is it off to shop for repair. and how costly will this be