need dash wiring harness for 87 mustang

i been looking for a wiring harness for a 87 mustang gt 5.0 manual 5 speed i just havent had any luck finding on this harness runs the gauges fan motor fuse box also it funs to the out sid of the car to the headlights and to the coilanod also there are to plugs right at the master cycl. to engine computer if you know where i can get on let me knon please