For the speedometer, simply make sure the VSS has a connection to power (+5V or +12V) and ground. Though the signal does go to the stock PCM, it also goes directly to the dash.
Thank you guys, i searched it all and got a lot of information but started getting a little confused on the vss and tach part of the wiring. But This is the information i was looking for. Im just trying to make sure I have everything figured out on making the new harness. Thanks again for the help.