it's a 2000 with a mach 460...so basically the radio comes with the harness that plugs into the back of the radio...and that will get wired into the adapter harness that crutchfield provided. The thing is is that the adapter harness has like 8 wires on it and the harness that goes into the pioneer has way more wires than that. also the adapter harness comes with a harness that has 4 RCA plugs but that doesnt have to do with the wiring im talking about

 

Edit* Spoke to crutchfield today...since i have the four RCA's half of the wires off of the pioneer harness won't be used. However this thread helped me a lot. thanks! **i vote sticky**