Cant find the wires that go from body to dash 07 ss/sc


Goblin Guru
You need access to a wiring diagram?
I found the boost signal is coming from the PCM (Powertrain control module/ engine control module)
C3 connector pin 10 is a tan wire that needs to go to your boost gauge.

GM calls the OBDII port the DLC (data link connector).
I found it gets power from Lighter fuse on pin 16, a red/white wire.

That same diagram has pin 1 of the DLC as the green GM low speed LAN wire that goes to the BCM and IPC.