I've got a 1992 RS that had a 305 TBI in it. I'll be dropping in my 406 soon, and I've heard that I might have to rewire my dash to work with the 1227730 Speed Density ECM. Is this true? If so, can anyone provide me with the dash wiring diagram for the TBI and the TPI harness? Thanks!

 

The only harness you need to change is the engine harness and the ECM. The dash harness, the one that controls turn signals/headlights and I think part of the AC harness stay the same. I just finished this swap yesterday. Here is a post that I made that will clear up the turn signal part.
https://www.thirdgen.org/techbb2/sho...hreadid=180129

Swap is pretty straight forward.

 

Thanks man! So we're still not clear on the turn signal piece? I'll just tag along in your thread to find the answer. Thanks again!

Scott