I have a wrecked 91 si and a clean 88hf. I bought the hf with the ecu harness all chopped up, they tried to rig their own obd-1 conversion.

I wanna swap out the ugly blue dash with the si's.

Can I switch out the 91 dash harness into the 88 to make it all plug in play/fix the ecu wiring with the 91s or will I run into any problems?

 

You should be able to just make sure you are using the same engine harness that goes with the dash harness.

 

Good deal, yeah im using the si engine harness too.