I have a 1992 Chrysler Lebaron convertible. I have bought a factory trip Computer that I would like to install in it. I had read that all 92 Lebarons had the wiring for it in the factory harness and the plug in was behind the radio. I have looked in that area and don't see any plug ins for it. Is it true that all 92s have this plug? If not, can I wire this in some other way?