i took one of my 92 ford mustang gt hatch with 6 speakers and took one of them out and said Premium Sound System so i take it that my car has Premium Sound System but the thing is that on the stock headunit the display does not work to see what channel i am on so
to install a headunit what kinda Wiring Harness do i need i found two



Metra Vehicle Wiring Harness (80-5511) Metra Ford Premium Sound System Vehicle Wiring Harness



OR

Metra 1985-Up Ford/Lincoln/Mercury/Mazda Vehicle Wiring Harness
Metra Vehicle Wiring Harness (80-1770)




so i do not know witch one to buy and also i have a aftermarket head unit for only 4 speakers is that ok and will that work

 

help

 

Check out this link.

http://www.crutchfield.com/S-Jdl22oN...00&I=120705006