1995 royale ls, some questions

What generation fo the 3.8 is in my car? series 1 or 2?
What kind of adaptor would i need to install an aftermarket headunit, or would i need to wire my old stereo up in the trunk to keep theftlock happy?

i have a 94 and its a series 1. i installed a new head unit and i went to best buy and bought the adapter for $20. you would have to ask the guy there which wires go to which. most is just color to color with your head unit but some are pending on what brand it is