90 ford mustang lx 5.0

1990 Ford Mustang LX 5.0 with a 5-speed. Picked it up from the second owner who kept it in Manhattan. She has 88k documented miles and is very nearly stock. Mods from stock are; 17x9 Cobra R's with "bobo" 245/40/17's, a monster tach that is not working correctly (wiring issue), and full...