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I HAVE A 1999 OX66 2 STROKE. I HAVE A 6Y5-8350T -90 TACH. I HAVE 1 PLUG LEADING FROM THE GAUGE FOR THE TRIM TILT,OIL TANK CAPACITY AND TEMP STATUS. I HAVE 1 HARNESS WITH A SINGLE 4 WIRE PLUG ON EACH END GOING FROM GAUGE TO ENGINE.THIS HARNESS WAS ORDERED WITH THE TACH. I NEVER HAD THE ORIGINAL HARNESS FOR THIS ENGINE .THE ORIGINAL HARNESS IS 68F-82553-XX-00 WHERE XX IS THE LENGTH.I BOUGHT THE ADAPTER 6Y5-85335-10-00 WHICH IS SUPPOSED TO MAKE A 1999 MODEL WORK WITH A -90 TACH.I PLUGGED THE ADAPTER IN AT THE ENGINE WHERE THE 2 PLUGS ARE LOCATED.ALL THAT WORKS IS THE OIL LEVEL INDICATORS,TRIM/TILT AND TEMP DO NOT WORK.I TALKED TO YAMAHA TECH SERVICES ABOUT THE PROBLEM AND WAS INFORMED THAT THE ADAPTER MUST BE PLUGGED IN AT THE CONSOLE UNDER THE GAUGE.THEY TOLD ME I NEEDED THE ORIGINAL HARNESS WITH 2 PLUGS ON EACH END FOR THIS TO WORK.WHAT IS THE DIFFERENCE IF THE ADAPTER PLUGS IN AT THE ENGINE OR UNDER THE TACH. ISN'T THE ORIGINAL HARNESS JUST AN EXACT EXTENSION OF THE 2 PLUGS AT THE ENGINE,PIN FOR PIN OR DO I NEED THE ORIGINAL HARNESS TO MAKE THIS WORK?IS THERE SOME KIND OF ELECTRICAL CROSSOVER OF PINS IN THE ORIGINAL HARNESS WHEN IT FINALLY GETS TO THE TACH OR IS IT PIN FOR PIN? 
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