I'm assuming you mean that you have a 2.5L, 2.6L is YAMAHA or OMC. You can use a multi-meter that has 1 inch test probes on it and backprobe the plug to find the voltage of it. It should be .25 volts with the throttle closed and the tan/black wire on the port cylinder head disconnected. From the starboard side of the engine looking at the TPS clockwise will lean it out and counter clockwise will richen it. I can tell you from experience though that this adjustment is EXTREMELY touchy and requires a meter to set it. You don't have to have the test harness to do it though.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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