I have a 94 suburban with a stock 454. For several years I have been running it on megasquirt with the injector grounds connected through a switch to both the megasquirt and the gm PCM and could switch between them and all worked good. Nice to have a back up. Now a new 489 motor going in and a switch to multi port. Megasquirt won't be a problem but I still would like to have the gm as a back up as it will still have to be in place to run the 4l80e. My PCM is 16196395 with BHDF. I have played with tunercat and have an idea of how the tuning works. I have searched and think the answer to the following question is yes but thought I would check. Will the 395 hardware do the job without any soldering or internal hardware changes.
thanks