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which stereo system do you have- am/fm w/cassette, am/fm w/cd, or am/fm only? And how many speakers- 2 or 4?
Here is the wiring diagram. It is in 2 parts so that you can read it better:
This is a Paysite
The other goes to an optional cd changer, as well as vehicle speed signal that goes into a power junction box behind the dash
Yes, it has to be plugged in.
The speed signal wire should be gray/blk. You will need to splice it into the Blk/Pink wire on other connector. This wire should be hot(12v) with the key in the run position. Test to make sure it is. Also test to make sure the gray/blk wire is also hot(12v) with key in run position. Sometimes the color coding given in the service manuals can be different from actual vehicle due to production date or other issue. As long as both are hot with key in run position you can splice the gray/blk into the blk/pink wire.
Wires referenced above are highlighted for you.
If for some reason the wire colors dont match, you will probably need a professional stereo installer to wire it so that they can trace down which wire is for the speed control signal and make sure it is wired in correctly.