Trim meter installation for 2008 F115TXR

Need assistance with installing trim meter for Yamaha F115TXR manufactured 10/08 (serial 68vx1103271) on Key West 176cc. Intend to use Teleflex Premier Pro series trim meter. Researching the issue I have learned that the trim sender wire should be pink. I verified the presence of the trim sender (w/ black and pink wires). I see only 2 pink wires in the 2 harness bundles going to the dash. One is in the large harness going to the ignition/kill switch assembly. This pink wire doesn’t appear to leave the switch assembly and gets lost in the bundle of wires. The other pink wire is bundled with an orange, grey and black wire forming a 4 wire bundle that goes to an analog (Pro Series II w/ oil and water temp warning lights) tachometer. The 4 wires attach to the tach via a 4 pin connector but all wires change color at the connector. The pink wire becomes red w/ blue stripe and attaches to a place marked “R” on the tach which appears to be directly behind the oil warning light. The orange wire becomes brown w/ blue stripe and goes to the “G” place behind the water temp warning light. The grey wire becomes blank on the other end of the connector and thus goes nowhere. The black wire becomes dark pink w/ red stripe but it is not attached to anything (terminates with male pin which is zip tied up). Other wires coming from the large harness attach to the tach (green, black, and 3 yellows (at “R”, “G” and another location) and a blue wire for instrument lighting. Long story short, the pink wire that I would have thought to be the trim sender wire is attached to the tach at the “R” location, but the analog tach does not indicate trim. I’m at a loss at this. Somehow I got to get a pink wire to the trim meter. Also there are two pink wires which terminate in the forward part of the lower engine cowling. Both terminate with plugs but I’ve read that these wires have to be connected together in addition to attaching the sender wire to the trim gauge. Is this true? Any help would be appreciated.

[boats.net]

Not sure if they used Yamaha harness to tach or aftermarket harness. It should have a 4 prong off white colored square connector connected to tach, disconnect that connector and check resistance of wires with an ohm meter(one meter lead to one of the wires and other meter lead to black wire), as move trim sender up and down by hand should see resistance change on ohm meter if meter is connected to right wire.

Thanks. May I ask what the function of the grey and orange wires are in the pink/orange/black/grey bundle? I assume black is ground. I will take ohm readings tomorrow to verify that the pink wire is trim, but it absolutely part of the pink/orange/black/grey wire harness (originates from the 4 pink wire connector at the motor) that based on my understanding is used to connect to a Yamaha digital multi-function tach via the square white connector. I suspect that these wires may be incorrectly connected to my Yamaha analog tach. When the 4-wire harness is connected directly to the analog tach pigtail via the white square connector (as is the case now) the pink wire is connected to the low oil pressure light, the orange wire is connected to the overheat light, and the black and grey wires connect to nothing (black wire terminates as a bullet type round metal connector on the tach side of the connector and connects to nothing, and the grey wire has no corresponding wire (socket is blank and plugged on the tach side)). I suspect that these connections are at least partly wrong but not knowing the function of the orange and grey wires I cannot be sure. It appears to me that an adaptor between the 4-wire harness and the tach pigtail would be appropriate for correctly aligning the wires to the analog tach, otherwise, I can eliminate the plastic connectors and connect the wires directly to the tach pigtail.

[boats.net]

You can't tell by wire colors, the harness on engine may have different color wires from trim/oil harness and change again at tach and depending on which trim/oil harness was used may be different color yet. Best to ohm out wires to find the one you need.

Thank you. Identified one wire in the bundle that responds while moving the trim sender arm. Ohms ranged from about 10 to 258. Was the black wire in the harness but changed color at the last white connector. That surprised me. Thought for sure black would be ground. One last question if I may. What are the two pink wires for (one terminates with male connector, other with female - both capped though) that lay in the bottom of the forward part of the engine cowling? I 've seen somewhere these shound be unplugged and connected, but since I'm getting proper resistance readings at the dash now this doesn't seem necessary. In the intrest of educating myself would you know what these are for? Thank you again for your help.

[boats.net]

Those would be for Command Link gauge installation.