No, your NA harness will not have the hookups to deal with a 7M-GTE. You will need a 7M-GTE harness.
I'd check if your '89 is early or late. Mine is an early '89, which has more in common with the '87-'88 than with the '90-'92. I pulled the 7M-GE from it, along with the wiring harness and ECU, and swapped in a 1987 7M-GTE with ECU and wiring harness. The ABS connector was different, and there was an issue with the headlights. I believe that these are addressed in the sticky, but in any case, neither is a real problem. I'm told that the electrical is the same for all '89s early or late, so you should be able to do the same thing.
READ! There's a ton of information out there, and if you read up on it first, you're not likely to have a problem or any gotchas when you swap in the motor.