I have a 1999 130 hp saltwater Yamaha that already has a water pressure gauge piped into the high side. Does it make any difference as to what side the temp sending unit is installed. I also have the two multifunction gauges installed and all the wiring neatly bundled away and I don't need to have it lighted so what are the minimum connections do I need to make for the temp gauge to function properly without having to pull all the wiring apart. Thanks.