I pulled the computer out of a 90 model crewcab chevy and most of the coputer harnass. I have two questions; first. inside under the dash there is a square plug that i had to diconnect prior to pulling the hanass thru the firewall. What do those wires go to? Second, after I split the hanass in the engine compartment and peeled all the sensors, plugs and related b.s. I was left with a few wires that run into the back of the fusepanel. What are these wires and do I just cut them by the fusepanel? I plan to use the 454 and the tbi in a bigblock oneton jeep, and the crewcab will be my towrig, receiving a 90 cummins nv4500 combo.

the small connector is tha ALDL or diag connector.

You should have some pink/black wires, those should be power for ecm and injectors. There was some other coolor wires that I had to give 12v, but Im tired and dont recall those. It was rather easy.

I say search and search, there are a lot of good threads to read on here.