I need help installing a Yamaha Multifunction Tach. I have an '03 Yamaha 115 hp 4 stroke. The gauge came with a harness with two plugs that run back to the motor, and I believe 4 or 5 wires that run to the inition switch. So far I have only been able to locate one plug coming off the motor, and I believe it only has two wires going into it from the motor - the wiring harness has 4 wires in each plug. Couple of folks I talked to at Yamaha said that my motor should have both plugs, but I can only find one, I even pulled the boat over to the nearest Yamaha dealer and they were also unable to locate the other plug. I checked a newer motor, 07 I believe, and it had two plugs coming off the motor. Some people have told me that newer motors only have 1 plug, but that clearly is not the case. My plan now is to hook up what wires I can without pulling the harness through the hull, and see what functions I get on the tach. Several people said I should get RPM from the ignition connection, is that true? I was really hoping to get the trim function to work. Unfortunately I don't have all the part numbers from the motor and the gauge in front of me, but I'll be happy to supply if someone needs them to answer my questions.
Thanks for any assistance.
Thanks for any assistance.
, occasionally when dealing with late style guages and pre 05 motors it requires an adapter at the engine side of the harness.
