[Meotchh]

Stock EQ? There is no EQ in a stock Stang.

The plug in harness for the 87-93 is very common. This is your best option providing someone has not already hacked the factory wiring. The harness can be bought @ any Radio Shack, auto parts stores, BBY, Circuit City, Crutchfield, & many Car Stereo shops. The plug in harness has all wires labled so it is simple for anyone with a basic knowledge of electronics & the english language to hook up.