I can't help you with a '94 Sport, but I can tell you that Metra does not have amp bypass harnesses for all applications. Case in point, my '97 XLT with Premium radio and "high series console" (radio controls on rear of center console). The Metra part number that is supposed to work for my truck has the wrong plug on one end. I could not find Scosche harnesses anywhere local. I even tried Crutchfield. They said they had a harness that would work. They sent me a half of a harness (one plug) connected to 100' of wiring to rewire the entire speker runs. This was supposed to make my life easier? No thanks!
I decided to download the wiring diagrams from Alldata.com, and 8 snips, 8 butt connectors and 16 crimps later, I bypassed the amp myself.
Good luck!