Wiring yamaha analog tach to 2010 115 4 stroke Page: 1 Jul 23, 2010Re: Wiring yamaha analog tach to 2010 115 4 stroke Rodbolt, I talked with the dealer parts guy, and he insists that the harness I got is the only one there is, and that the harness will work. That I just need to connect the other wires to the ignition - but the color coding may not be correct.Yamaha analogue tachometer wiringSep 06, 2013Need help with tach problem Yamaha 115 Four Page: 1Sep 02, 2009Yamaha 115 4-stroke tach install Page: 1Feb 13, 2006See more results Wiring Color Codes for YAMAHA Outboard Motors. Here is a listing of common color codes for Yamaha outboard motors. There is an industry-standard set of wire codes in general use by most manufacturers except Yamaha. Colors listed here may vary with year & model but in general should be a good guide when tracing Yamaha wiring troubles.