repowering with yamaha from evinrude

i'm repowering a boat with a yamaha 115 4s that had an evinrude e-tec and am having problems figuring out the difference in wire colors. i have a 4 wire harness that is labeled "to engine" and "to guages" at opposite ends with a pink, gray, green, and green/red wire. what are these wires for? i don't have the harness to plug them into at the guage end and don't know what each wire is for. tried searching and found this forum very informative, but couldn't find the answer. thanks for the help

[boats.net]

That harness is for the Yamaha digital gauge for trim signal, overheat and low oil warning light. If you don't have the Yamaha gauge that harness is not needed.

thanks for the help!

i need a wiring diagram for this motor without the digital and/or multifunction gauges please

i should also add that i am trying to hook this up to some faria gauges, not yamaha

[boats.net]

There is a yellow,green,red and black wires at key switch, these are the gauge wires.
Green= tach signal lead
Yellow= 12 volts key on power
Black= ground
Red= 12 volts constant(to be used for digital gauge only)
Set tach setting for 12 pole alternator setting.