I am new to this forum I have a 1983 17-ft Glastron model ssv176 with a 140 Johnson. The wiring has been changed and I can't seem to get the gauge to work properly don't know which wires should you go to the gauge I do not have a schematic which would help I know the sensor is supposed to hook to the gauge but it also goes to the relay box can anybody help me thank you ahead of time.