I figured out the wires to use, so I thought I would share it with anyone else doing the nav install. The reverse wire can be found on the red wire with black stripe, number 14 on the 16 pin C8 connector (white) on the back of the instrument panel. The speed sense wire can be found on the violet wire with the white stripe, number 10 on the 10 pin C9 connector (grey), also on the back of the instrument panel.
To get to the back of the instrument panel, take out the two phillips screws on the top underside of the plastic surround in front of the instrument panel glass. Remove the surround. Remove 4 phillips head screws securing the instrument panel. Remove the instrument panel. There are four harnesses on the instrument panel. The two your are interested in are the middle two.
I have not so far had any luck finding a double DIN woodgrain replacement panel, but I did get a pretty good fit on the plastic universal trim peice after cutting it to size and a bit of fine sanding. If anyone finds a woodgrain one that will work, please let me know.
Paul
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Paul, How did the nav install go? I am happy that I could help you out with your nav project.