Its best to do the conversion with the 93/97 harness and pig tail the 08 harness.
For example I will be doing the same with the exception the reverse lights [clear] will be just Amber turn signals. The dual filament brake bulbs will be brakes/running lights. I have a manual switching setup for the reverse lights which are flushed mounted cubes in the back bumper and I like the amber turn signals still but only the red/clear lenses.
So on the 08 harness, plug the sockets where they go and cut them off 4-6" back, then do similar to the 96 harness UNLESS it looks like they used the same plugs and pins - de pin them and just swap them as needed.
This is another method that can be used fully or modified further for your needs.
http://www.therangerstation.com/how-...converter-kit/
http://www.therangerstation.com/how-...5-tail-lights/