Ah. That harness runs through the passenger fender and plugs into the the other harnesses in two spots:
* Passenger firewall, in the corner: plugs for the engine & transmission harnesses
* Under the air filter: two plugs connecting to the fuse box harness
The same ECU harness runs to the CCRM and fan as well. It's certainly do-able but it's still a PITA. It might be easier to pull that part of the harness out, properly repair it and re-wrap the harness so the splices aren't visible. For a new harness, try eBay or your local junkyard.