1994 Johnson Evinrude "ER" 90 LV 120 thru 140, 185 thru 225, 250, 300 Service Repair Manual P/N 500612, Page 368Get this manual
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Tachometer CircuitV6,
If the VRO "no oil" warning signal is in question, or if the boat's tachometer is not working, test the tachometer circuitA C.Dadapter box such as Stevens model SA-6