Thanks for all for responses. The wiring harness that came from the previous boat does have three wires to go to a trim gauge. I don't have one so I'm not using those wires. I have the service manual that does show a two pin connector going to the trim limiter switch (although it does not give color coding) and I do find the adjustment cam for the trim limiter. However the trim limiter does not work. I assume this is because the connector is not plugged in. I have searched around the motor and can't find a mating plug. The service manual does not show a plug for this on the instrument harness, so I assume it should be within the motor housing. In any case, the motor does not contact the boat's motor well, even at full tilt, so it probably doesn't matter.