Old fixer up...
On a side note.. We're a good place to get some shirts? Like f body or ls/ performance company apperal?
I just fixed a speedometer issue with a GMC Sonoma and it took me forever to figure out there was a short in the cruise control speed sensor cable which fried the VSS circuit on the PCM so it was not sending a speed signal to the cluster, hopefully this doesn't happen with yours. Good luck and let us know updates

oh and LS1tech shirts? http://ls1techgear.com/main.sc
get the OBD2 Bluetooth tool
they are under $20 
