Truck Side wiring

[Wagonbacker9]

Tachometer has to be hooked but youll have to tell nelson or who ever tunes it the model of your truck and theyll tune the pulse so it will register right.
Vss also has to be connected and you can either feed the guage thru the drac box or you can use the speedometer output wire from the new harness and do it that way. Check out the obs to lsx conversion thread... redheartbeat has some good info about speedometer wiring. If you have any other questions just ask... were here to *try* to help!

I'm doing my own tuning, and the speedo is just one of many concerns, but I do thank you for your input. I have read through the sticky, and just about every other resource I can track down. I feel pretty solid on most of the other stuff:

1" setback mounts needed to maintain current drivetrain position
using the pump/regulator out of the GTO for the truck after I upgrade the GTO assembly, returnless.
Wiring harness mods to be made based on info off LT1swap.com
HPTuners to flash in the correct tune, delete trouble codes, remove VATS etc

The only stuff I'm really not solid on thus far is what connections need to be made truck side, and ideally, what wires in what locations and colors they are.