For the PCM, we have a few routes to go by... We can set the pcm to receive the reading from our tranny using a modified VSS from a tranny that was supposed to work with the 3800 and it woill output a sinal that our speedo can understand... but since I am going manual and so are you, then we can use the stock fiero conversion, vss straight to speedo. the ecm will never care, it thinks it's always in neutral.
What we DO care about is turning off any cesors that are not used. (break related, ac related pass key, ect..)
and for performance, You can make a spare chip that has 100% boost all the time!
(harder on the SC, but really handy during king of the hill or the solo races.)
depending on your fuel delivery, cam, compression ect, we can mess with fuel curves.. but not too familiar with that just yet..