I have a 2018 RT-198p with a 1504S Merc. that I got late last fall, I got about 7 hours on it before putting it up for winter. I would like to put a trim gauge on it. I looked under the dash for the Merc. trim sender wire ( brown with white stripe) but it was not there. Only loose wire was a lite red wire with a Purple stripe! Motor has the trim sender on it with 3 wires coming out of it ( red,black,white ) plugged into (yellow,purple/black stripe,black/green strip). Those wires go into the elect. control box. I do see a brown/white strip in the wire group leaving the motor heading towards the dash. Does anyone know what the wire colors are on the trim gauge in a RT-188 ? Where can I hind the Merc. trim sender wire, could it be around the throttle control box?