Standalone Harness - what to wire in

[cebra]

I am trying to determine what wires from a Gen III DBC standalone harness will come inside of the cab? VSS for the speedo as an example. I currently have my in-cab harness pulled and am rewiring it to a fuse block out of a 92' Blazer since my panel/harness was in rough shape. I am also hard wiring my cluster for the S10 speedo swap while I am in there.

I am trying to figure out what wires are needed to connect to a standalone harness (basically which come inside the cab from the standalone harness), I assume at least one +12V is needed no matter how "standalone" the harness is, fuel pump? etc. Thanks for any assistance.

[1957 Chief]

Tryin to decipher your question here.

From the stand alone harness to inside the truck, what wires do you need to come out?
If your standalone harness relay/fuse block is in the engine compartment you will need from the cab:
Constant 12V
Switched 12V
Another ground (you can't have too many)
Oil pressure gauge
Water temp gauge
AC control??

From the harness going into the cab:
VSS
Tach
Check engine light (will need a ground on the other end)
OBD2 connector
Torque converter lockup

Fuel pump/fan wires usually come from the harness fuse/relay block. So they will stay in the eng compartment and go from there.

I might be missing something, but those are the basics.

Bubba

[cebra]

Perfect, thank so much.

[ls1nova71]

Just an fyi, the check engine light needs ignition power, not a ground.