Generally, the speed sensor wires go to the PCM(computer). The PCM processes that info and then sends a signal to the speedo on a separate wire. If the Firebird speedo is electrically operated, which I believe it would be since you have VSS wires from the trans, you have to use the wire that originally fed the speedo on the Bird to the new speedo. You will probably still need the buffer box to get the right signal to the new speedo.
A wiring diagram of the Firebird would be helpful since most of the stuff you have is from that car.
Try this site:
http://search.ebscohost.com/login.as...ile=autorefctr
User name: student
Password: watc
If you prefer, here's one on CD. Others are available but somewhat pricey.
http://www.ebay.com/itm/1988-Pontiac...661549&vxp=mtr
Originally Posted by Mickeymotormount
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