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Have a Yam 115TRL motor. We need the electrical diagram to install a Tilt/Trim Gauge in the unit. I think it is a 2 wire unit with a 100-550 ohm transmitter. But I am not sure. Do not access to the 2006 Rigging guide. Has anyone put a non-Yamaha Tilt/Trim Gauge on one of these. Any help appreciated.