I am trying to wire a 225 twin application and having some issues. These motors are different years and i have the wiring harness for each motor. One motor has the regular round main plug at the engine side and the a smaller 3 prong plug the other has the regular round main plug and a 6 prong plug. These all mate at the engine and there is no problem.

At the gauge end of the wiring harness is where I am having problems. I have dual tachs and trim gauges and the dual key switch with dummy lights. On the one wiring harness with the 6 prong plug at the engine there are 5 plugs at the gauge end and one plug which also has 6 prongs but has no where to plug all the other plugs connect. Do I need to use this 6 prong plug at the gauge end.

i also need the color codes to hook up the tach and trim gauges.

Hope this make sense! Thanks for the help...

Hard to say, depending on exact model of motors, brand of gauges, and wire harness's you are using.
The basic gauge wiring is
Black = ground
Black/Yellow = 12 volts key on power
Gray = Tach signal lead
Red/White = Backlight in gauges

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