Re: 1989 evinrude 90 vro
well personally , i would change to either premix fuel and disable the mixing pump oil side, or i would install a new OMS pump. you have the old VRO2 pump, known to cause problems.
J/E Alarms
low oil alarm is a beep every 30 seconds. beep......................beep...................
no oil alarm is a beep every 1/2 second or so.beep,beep,beep
Fuel restriction or overheat alarm is a constant beep.beeeeeeeeeeeeeeeeeeeeeep
could be bad sending unit, bad horn, or shorted wire.