Re: Mercury 200hp
If it's the same as on my V6 carb engine then the warning module is common to both circuits. The oil warning circuit checks both float level in header tank and also that the oil pump shaft is rotating at engine speed. The oil pump rotation sensor outputs a pulse to the warning module which is compared to the primary circuit on one of the coils (No 4 I think). If the two don't match then the module outputs an oil alarm (bleep..bleep...bleep). Overtemp alarm (continuous bleep) also output from this module.
