I've been putting together an engine for my 93 talon NA. I bought a used 1991 4G63T engine and transmission and a used 2G engine. I have installed the 1G turbo block and manual FWD transmission. And have put the 2G head and intake manifold on it. I guess I need some tech advice to finish. I have a 1G turbo ECU and a 2G ECU with ECMLink. Betting that I will need to tune this set up, I want to go with the 2G ECU so I acquired a used engine harness and dash harness. What should I expect to have to do in this situation and is it obviously better to put as much 2G parts on as possible if I'm going with the 2G ecu and harness? Do I need to swap out both harnesses? I'm obviously a newbie and would appreciate professional advice that I rely on from here.

why would you go with 2g. I see no advantage and a lot of work to make that happen. 1g ecu, dsmlink. Done.

Because I don't have dsmlink in my 1G ecu but have ESMLink in the 2G ecu.

Consider selling the 2G ECU and get a 1G ECU with DSMLink.