OK so I'm adding a tilt tube to my boat ...it use to be a transom mount and cable directly to engine tiller ...original 14ft cable.....now I measured center of wheel to Grunwald close to 2 ft measures dash to rear 10ft measure rear Grunwald to center motor tiller arm just over 3ft so my dilemma is should I get a 15 ft cable or 16 ft...and for reference it is a rack o pinnoin steering system...thanks for the help..